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
HAM test is done for 
Select and explain. 
A. G.P.I. anchor protein, B. Complement defect, C. Spectrin defect, D. Mannose binding protein
A: G.P.I. anchor protein
Answer: A: G.P.I. anchor protein 
Explanation: None