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
True about meningococcal meningitis is 
Select and explain. 
A. Vaccine can be given in pregnancy, B. Cases are the most important source of infection, C. Treatment with penicillin eradicates carrier state, D. Causative agent is a gram –ve diplococci
D: Causative agent is a gram –ve diplococci
Answer: D: Causative agent is a gram –ve diplococci 
Explanation: None