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: Medicine
An abnormal Ham test is most likely associated with which of the following ? 
Select and explain. 
A. Defect in spectrin, B. Defective GPI anchor, C. Defect in complement, D. Mannose-binding residue defect
B: Defective GPI anchor
Answer: B: Defective GPI anchor 
Explanation: .