tonsil is multi mass of lymph tissue at back of tongue

Correct Answer: B

Rationale: Lingual tonsils are multiple masses at the tongue's base.

Correct Answer: A

Rationale: T-cell receptors are exclusive to adaptive immunity (T cells); TLRs , mannose receptors , and complement receptors are on innate immune cells like macrophages.

Correct Answer: C

Rationale: Hyperactivation is the highest macrophage activation state, beyond resting or basic activation ; MHC II upregulation is a feature, not a state.

Correct Answer: A

Rationale: NKT cells have limited TCR diversity ; gamma-delta and alpha-beta T cells have broader repertoires.

Correct Answer: B

Rationale: Natural Treg cells suppress self-reactive T cells ; they don't activate , target B cells , or cause hypermutation .