This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': '100 people of viral fever are treated with a medicine 94 percent were cured in 5-7 days. True statement about efficieny of medicine- \nSelect and explain. \nA. Medicine is effective, B. Cannot be commented, C. Medicine is ineffective, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]