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: Microbiology
Complement necessary for neisseria infection is/ are - 
Select and explain. 
A. C5, B. C6, C. C7, D. All
D: All
Answer: D: All 
Explanation: Ans. is All 'a' i.e., C 5; 'b' i.e., C 6; 'c' i.e., C 7