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': 'All of the following facts are true with group discussion except \nSelect and explain. \nA. Group discussion is very effective method of health education, B. The group should sit in a circle, C. Group members should not have known each other before, D. There should be a group leader to initiate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]