Which of the following is an example of a zoonotic disease?

Correct Answer: C

Rationale: Rabies (C) is zoonotic, transmitted from animals (e.g., dogs) to humans. A, B, and D are primarily human diseases.

Correct Answer: B

Rationale: Prospective cohorts (B) track incidence and establish temporality (e.g., smoking before cancer). A, C, and D are false; they’re costly, long, and prone to loss.

Correct Answer: C

Rationale: Case-control studies (C) rely on memory, risking recall bias (e.g., cases recalling exposures differently). A, B, and D are less primary.

Correct Answer: A

Rationale: Descriptive studies (A) describe patterns but can’t prove causation (e.g., mapping cholera). B, C, and D may occur but aren’t primary.

Correct Answer: C

Rationale: Cohort studies (C) follow disease progression (e.g., HIV). A is snapshot, B is retrospective, D is interventional.