This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Mass prophylaxis not done in \nSelect and explain. \nA. Scabies, B. Lymphatic filariasis, C. Vitamin A deficiency, D. Worm infestation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]