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: Dental
Practices that have been repeated by a number of generation, practices that tend to be followed simply because they have been followed in the past. This refers to - 
Select and explain. 
A. Habits, B. Beliefs, C. Customs, D. Convention
C: Customs
Answer: C: Customs 
Explanation: None