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 are true for a group discussion except \nSelect and explain. \nA. Not a very effective method of health communication, B. Ideally a group should comprise of 6-12 members, C. Can lead to change in health attitudes and behaviour, D. Allows free exchange of ideas and opinions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]