Bias: practice question

A PSM 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.

Try it

PSM · Bias

Sample item

What bias occurs when screening detects slow-growing disease preferentially?

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

The answer and the reasoning

A. Length bias

This item reviews Bias; Length bias is the best answer because it directly fits the forensic or public-health principle described.

Option by option

  • A. Length bias (correct)

    Correct. Length bias matches the defining principle.

  • B. Observer bias

    Observer bias is unsupported by the key information.

  • C. Recall bias

    Recall bias does not fit the stated scenario.

  • D. Confounding

    Confounding is plausible but not the best answer.

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.

More PSM questions

Questions about this PSM question

What is the answer to this PSM question?

The best answer is A, Length bias. This item reviews Bias; Length bias is the best answer because it directly fits the forensic or public-health principle described.

Why is "Observer bias" not the answer?

Observer bias is unsupported by the key information.

Why is "Recall bias" not the answer?

Recall bias does not fit the stated scenario.

Why is "Confounding" not the answer?

Confounding is plausible but not the best answer.

What concept does this question test?

It tests Bias in PSM. The correct option holds because: Correct. Length bias matches the defining principle.

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 Bias?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM 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.