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 of the following is the most common cancer of thyroid \nSelect and explain. \nA. Anaplastic carcinoma, B. Follicular carcinoma, C. Papillary carcinoma, D. Medullary carcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Papillary carcinoma is the most common malignancy of thyroid, accounts to 70-80% of all thyroid malignancies. It has the best prognosis of all thyroid cancers. Source : Sabiston 20th edition pg : 900', 'role': 'assistant'}]