What is the term for a disease that occurs occasionally and at irregular intervals in a population?

Correct Answer: C

Rationale: Sporadic (C) is occasional, irregular occurrence (e.g., tetanus). A is constant, B is excess, D is global.

Correct Answer: B

Rationale: Cohort studies (B) track multiple outcomes (e.g., smoking and various diseases). A, C, and D are false; they’re costly, slow, and bias-prone.

Correct Answer: B

Rationale: Case-control studies (B) efficiently study rare diseases (e.g., cancer) by starting with cases. A, C, and D are false.

Correct Answer: C

Rationale: Cohort studies (C) compare exposed vs. unexposed outcomes (e.g., smoking and cancer). A is snapshot, B is retrospective, D is experimental.

Correct Answer: C

Rationale: Matching (C) controls confounders (e.g., age) in case-control studies. A, B, and D are incorrect or unrelated.