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
[{'content': 'All are true regarding medullary carcinoma of thyroid except - \nSelect and explain. \nA. It arises from C cells, B. Secrete high levels of calcitonin, C. It is dependent on TSH, D. Most cases are familial', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . It is dependent on TSH', 'role': 'assistant'}]