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
A most common subtype of thyroid cancer is? 
Select and explain. 
A. Medullary carcinoma, B. Papillary carcinoma, C. Follicular carcinoma, D. Anaplastic carcinoma
B: Papillary carcinoma
Answer: B: Papillary carcinoma 
Explanation: Papillary carcinoma is the most common of the thyroid neoplasms and is usually associated with an excellent prognosis, particularly in female patients younger than 40 years.
About 70% to 80% of patients in the United States in whom thyroid carcinoma is newly diagnosed have papillary carcinoma.