A 10 year old child had frequent acute tonsillitis & his mother was advised to consider tonsillectomy. Which of the following statements is correct about this case?

Correct Answer: C

Rationale: Tonsillectomy typically removes palatine tonsils ; lymphocytosis may occur , lingual tonsils are not usually removed , nodules vary .

Correct Answer: C

Rationale: CD3 transmits activation signals in T cells ; antigen recognition is TCR's role, not transport .

Correct Answer: B

Rationale: Negative selection eliminates self-reactive T cells ; it refines tolerance, not just foreign attack , not self-attack , not B cells .

Correct Answer: C

Rationale: Antibodies don't release interferon (C, from infected cells); they opsonize , attract macrophages , and agglutinate antigens.

Correct Answer: C

Rationale: Memory is evidenced by faster, stronger secondary responses ; receptor numbers , cytokines , or swelling are less direct indicators.