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': 'What’s the prognosis of thyroid cancer is \nSelect and explain. \nA. Papillary, B. Medullary, C. Anaplastic, D. Folicular', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Best prognosis — papillary\nWorst prognosis - anaplastic', 'role': 'assistant'}]