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
[{'content': 'Heriditory spherocytosis is caused by \nSelect and explain. \nA. Spectrin deficiency, B. Hb deficiency, C. Incresed sodium levels, D. Increased calcium levels', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Spectrin causes membrane loss leading to spherical shape of rbc', 'role': 'assistant'}]