This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Most well differentiated thyroid tumor is \nSelect and explain. \nA. Papillary carcinoma, B. Medullary carcinoma, C. Follicular carcinoma, D. Anaplastic carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Papillary carcinoma # Follicular cell origin: (A) Differentiated. (B) Undifferentiated.# DIFFERENTIATED:* Papillary carcinoma (60%);* Follicular carcinoma (15%);* Mixed papillary and follicular carcinoma.# UNDIFFERENTIATED:* Anaplastic carcinoma (13%).> Clinical features: It is the most slow growing among the malignant tumours of the thyroid.', 'role': 'assistant'}]