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: Medicine
[{'content': 'Hereditary spherocytosis, all are true, except \nSelect and explain. \nA. Increased osmotic fragility, B. Autosomal dominant disorder, C. Increased surface area to volume ratio, D. Direct coombs test is diagnostic', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]