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': 'Principle for chinese medicine - \nSelect and explain. \nA. Yang, B. Vin, C. Both, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Both o Chinese medicine is based on two principles:- i) Yang : Active masculine principle ii) Vin : Negative feminine principle o The balance of these two opposing forces meant good health. o The Chinese were early pioneers of immunization. They practised variolation to prevent smallpox. o The Chinese system of 'bare-foot doctors' and accupuncture have attracted worldwide attention in recent years.", 'role': 'assistant'}]