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': 'An accustomed way of doing things is known as: \nSelect and explain. \nA. Habit, B. Custom, C. Belief, D. Ritual', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Habit is an accustomed way of doing things. It is the usual way of action that can be performed without thinking. Chapter: Medicine and social sciences. Ref: Park 21st edition, page: 627.', 'role': 'assistant'}]