This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'Which thyroid malignancy can present with diarrhea? \nSelect and explain. \nA. Papillary carcinoma, B. Follicular carcinoma, C. Medullary carcinoma, D. Huhle cell carcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A patient with a sporadic medullary thyroid cancer typically has one of two manifestations: a palpable mass in the thyroid that is present in most cases and for which a diagnosis can be made with FNA with immunohistochemistry or the finding of an elevated calcitonin level This calcitonin excess may rarely result in symptoms of diarrhea and flushing in patients with advanced disease Source : Sabiston 20th edition Pg : 909', 'role': 'assistant'}]