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: Pathology
Which is the most common cause of spherocytosis 
Select and explain. 
A. Hereditary spherocytosis, B. GCPD deficiency, C. AIHA, D. PNH
C: AIHA
Answer: C: AIHA 
Explanation: Auto immune hemolytic Anemia (AIHA) is the most common cause of spherocytosis.