This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Recurrent Neisseria infections are associated with deficiency of 
Select and explain. 
A. C5, B. C6, C. C7, D. All of above
D: All of above
Answer: D: All of above 
Explanation: .