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: Surgery
[{'content': 'Papillary carcinoma thyroid:\na. Most common thyroid cancer\nb. Psammoma bodies seen\nc. Encapsulated\nd. Blood borne metastasis is common \nSelect and explain. \nA. ab, B. bc, C. cd, D. da', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common thyroid cancer; b. Psammoma bodies seen; c. Encapsulated.', 'role': 'assistant'}]