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
Custom is defined as - 
Select and explain. 
A. Established pattern of behavior, B. Prescribed order of cremony, C. Ban to a paicular activity, D. None
A: Established pattern of behavior
Answer: A: Established pattern of behavior 
Explanation: Ans. is 'a' i.e., Established pattern of behavior