Viral infections: wart cryotherapy: practice question

A Dermatology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dermatology · Viral infections: wart cryotherapy

Sample item

A child has a common wart treated with liquid nitrogen cryotherapy. What is the approximate temperature of liquid nitrogen?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Minus 196 degrees C

Liquid nitrogen boils at minus 196 degrees C and is the most widely used cryogen for warts and other superficial lesions. Cell death results from ice crystal formation and vascular stasis.

Option by option

  • A. Minus 79 degrees C

    Minus 79 degrees C is the temperature of solid carbon dioxide (dry ice).

  • B. Minus 89 degrees C

    Minus 89 degrees C is that of nitrous oxide.

  • C. Minus 196 degrees C (correct)

    Correct. Liquid nitrogen is at minus 196 degrees C.

  • D. Minus 50 degrees C

    Minus 50 degrees C is too warm to be a standard cryogen.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dermatology question

What is the answer to this Dermatology question?

The best answer is C, Minus 196 degrees C. Liquid nitrogen boils at minus 196 degrees C and is the most widely used cryogen for warts and other superficial lesions.

Why is "Minus 79 degrees C" not the answer?

Minus 79 degrees C is the temperature of solid carbon dioxide (dry ice).

Why is "Minus 89 degrees C" not the answer?

Minus 89 degrees C is that of nitrous oxide.

Why is "Minus 50 degrees C" not the answer?

Minus 50 degrees C is too warm to be a standard cryogen.

What concept does this question test?

It tests Viral infections: wart cryotherapy in Dermatology. Cell death results from ice crystal formation and vascular stasis.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Viral infections: wart cryotherapy?

Learn each condition by its primary lesion, site and signature sign. Then use the flashcards and the other Dermatology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.