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: Medicine
True about meningitis is /are -a) Epidemic is caused by H. influenzaeb) E.coli, Group B Streptococci is MC cause in neonatal periodc) Hib vaccine is effective in prevention of meningitisd) Epidemics caused by meningococcus group B 
Select and explain. 
A. bc, B. c, C. ac, D. ad
A: bc
Answer: A: bc 
Explanation: None