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: Pathology
Mutation of which of the following gene is most impoant in Paroxysmal Nocturnal Hemoglobinuria 
Select and explain. 
A. Decay accelerating factor (DAF), B. Membrane inhibitor of reactive lysis (MIRL), C. Glycosyl phosphatidyl inositol (GPI), D. CD8 binding protein
C: Glycosyl phosphatidyl inositol (GPI)
Answer: C: Glycosyl phosphatidyl inositol (GPI) 
Explanation: .