Which lymphoid organ is encapsulated by connective tissue?

Correct Answer: A

Rationale: The thymus has a connective tissue capsule; tonsils , appendix , and Peyer's lack full encapsulation.

Correct Answer: B

Rationale: The thymus is in the thorax; abdomen has spleen, pelvis has bladder, neck has thyroid.

Correct Answer: B

Rationale: Hypersensitivity is an overreaction to allergens; autoimmunity is self-attack, immunodeficiency is weak, tolerance is non-response.

Correct Answer: B

Rationale: Red pulp has macrophages ; lymphocytes , T , and B cells are in white pulp.

Correct Answer: C

Rationale: Tonsils trap pathogens; T cells are thymus, blood is spleen, antibodies are B cells.