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': 'About papillary carcinoma what is true \nSelect and explain. \nA. Often encapsulated, B. Prognosis bad, C. Lymph node metastases is common, D. Iodine deficiency is a impoant risk factor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Papillary thyroid cancer is most common thyroid cancer and has the best prognosis. Not commonly encapsulated. Spreads commonly by lymphatic route. Irradiation is the impoant risk factor . Iodine deficieny is a impoant risk factor for follicular cancer. Source : Sabiston 20th edition Pg : 902', 'role': 'assistant'}]