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: Anatomy
[{'content': 'Which type of thyroid carcinoma has the best prognosis \nSelect and explain. \nA. Papillary Ca, B. Anaplastic Ca, C. Follicular Ca, D. Medullary Ca', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "In general pts. with PTC (Papillary Thyroid Carcinoma) have an excellent prognosis with a greater than 95% 10-year survival rate." Papillary carcinoma of thyroid is a slow growing tumor, usually not associated with blood borne metastasis, and hence has a better prognosis than the other varieties. Follicular, Medullary and Anaplastic carcinomas are all associated with a greater incidence of blood borne metastasis and a poorer prognosis. Ref : Schwaz Surgery 9/e p1362', 'role': 'assistant'}]