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': 'Best prognosis of thyroid cancer Is \nSelect and explain. \nA. Papillary, B. Medullary, C. Follicular, D. Anaplastic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Best prognosis — papillary\nWorst prognosis – anaplastic', 'role': 'assistant'}]