Correct Answer: A

Rationale: Staging describes the extent of cancer at diagnosis, correlating with prognosis. It doesn?t measure cell replacement rates, describe tumor biology (which is classification), or define cancer growth mechanisms, but rather quantifies disease spread for treatment planning.

Correct Answer: D

Rationale: Conscious or unconscious sedation is most effective for managing pain during bone marrow tests, with relaxation, opioids, and EMLA as adjuncts. Sedation ensures comfort and minimizes distress during this invasive procedure.

Correct Answer: C

Rationale: Pediatric cancer clinical trials compare the best current therapy (control group) with potentially better treatments (experimental group). They?re accessible beyond major centers, require consent for all therapies, and are tailored by disease type and stage, not standardized.

Correct Answer: C

Rationale: Alkylating agents replace a hydrogen atom with an alkyl group, disrupting DNA and causing cell death. Plant alkaloids block spindle formation, antimetabolites mimic metabolic elements to halt DNA synthesis, and antitumor antibiotics interfere with DNA replication and transcription.

Correct Answer: C

Rationale: Chemotherapy-induced alopecia may result in hair regrowing with a different color or texture. Children choose preferred head coverings, sunlight risks sunburn, and hair typically regrows within 3-6 months post-chemotherapy, not 12 months.