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
Recurrent Neisseria infections are predisposed ina) Early complement component deficiencyb) Late complement component deficiencyc) C1 esterase deficiencyd) Properdin deficiency 
Select and explain. 
A. bd, B. d, C. ab, D. ac
A: bd
Answer: A: bd 
Explanation: None