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
All of the following facts are true with group discussion except 
Select and explain. 
A. 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
C: Group members should not have known each other before
Answer: C: Group members should not have known each other before 
Explanation: None