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
Which type of thyroid carcinoma has the best prognosis 
Select and explain. 
A. Papillary Ca, B. Anaplastic Ca, C. Follicular Ca, D. Medullary Ca
A: Papillary Ca
Answer: A: Papillary Ca 
Explanation: "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