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': 'Chadah committees recommended all except \nSelect and explain. \nA. Concept of multipurpose worker, B. PHC at the block level, C. One basic health worker per 10,000 populations, D. The family planning Health assistants were to supervise 3 to 4 of this basic health worker', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]