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
The most common structural red cell defect without Hb abnormality is - 
Select and explain. 
A. Elliptocytosis, B. Spherocytosis, C. Poikilocytosis, D. Sickle cell disease
B: Spherocytosis
Answer: B: Spherocytosis 
Explanation: None