Answer and explanation

Correct answer: C. Preventive measure or treatment undertaken to ward off disease

  1. Step 1: Greek 'prophylaxis' means to guard against beforehand. Step 2. Prophylaxis denotes clinical interventions (e.g. vaccines, prophylactic antibiotics, antimalarials) designed to prevent infection before it occurs. Answer: Preventive measure or treatment undertaken to ward off disease. Why not the others: Pain relief is palliative care; Tumor excision is resection; Diagnostic screening is imaging/laboratory testing.

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