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': 'Custom is defined as - \nSelect and explain. \nA. Established pattern of behavior, B. Prescribed order of cremony, C. Ban to a paicular activity, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Established pattern of behavior", 'role': 'assistant'}]