Study design: 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.

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PSM · Study design

Sample item

Best design for rare disease is often what?

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

The answer and the reasoning

D. Case-control study

This item reviews Study design; Case-control study is the best answer because it directly fits the forensic or public-health principle described.

Option by option

  • A. Cohort only

    Cohort only does not match the stated scenario.

  • B. RCT always

    RCT always is plausible but not the single best answer.

  • C. Ecological only

    Ecological only is not supported by the key finding.

  • D. Case-control study (correct)

    Correct. Case-control study is supported by the defining principle.

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 D, Case-control study. This item reviews Study design; Case-control study is the best answer because it directly fits the forensic or public-health principle described.

Why is "Cohort only" not the answer?

Cohort only does not match the stated scenario.

Why is "RCT always" not the answer?

RCT always is plausible but not the single best answer.

Why is "Ecological only" not the answer?

Ecological only is not supported by the key finding.

What concept does this question test?

It tests Study design in PSM. The correct option holds because: Correct. Case-control study is supported by 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 Study design?

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.