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': 'Which of the following is true about meningococcal Meningitis - \nSelect and explain. \nA. Case fatality less than 10% in untreated cases, B. Cases are the main source of infection, C. Rifampicin is the drug of choice, D. Treatment in the first 2 days can save the life of 95% cases', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]