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
100 people of viral fever are treated with a medicine 94 percent were cured in 5-7 days. True statement about efficieny of medicine- 
Select and explain. 
A. Medicine is effective, B. Cannot be commented, C. Medicine is ineffective, D. None of the above
B: Cannot be commented
Answer: B: Cannot be commented 
Explanation: .