The thymus produces which hormone?

Correct Answer: B

Rationale: Thymosin from the thymus aids T cell maturation; insulin is pancreas, adrenaline is adrenal, cortisol is adrenal.

Correct Answer: A

Rationale: The marginal zone separates red and white pulp; others (B, C, D) are unrelated.

Correct Answer: C

Rationale: Neutrophils are granulocytes; lymphocytes and dendritic cells are agranulocytes, monocytes become macrophages.

Correct Answer: C

Rationale: Lymphocytes are agranulocytes; neutrophils , eosinophils , and basophils are granulocytes.

Correct Answer: B

Rationale: T cells mediate type IV (delayed); B cells are humoral, mast cells are type I, neutrophils are innate.