This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Heriditory spherocytosis is caused by 
Select and explain. 
A. Spectrin deficiency, B. Hb deficiency, C. Incresed sodium levels, D. Increased calcium levels
A: Spectrin deficiency
Answer: A: Spectrin deficiency 
Explanation: Spectrin causes membrane loss leading to spherical shape of rbc