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: Radiology
Post irradiation thyroid tumor is: 
Select and explain. 
A. Follicular CA, B. Papillary CA, C. Lymphoma, D. Huhle cell tumor
B: Papillary CA
Answer: B: Papillary CA 
Explanation: B i.e. Papillary CA Radiation is an etiological agent for papillary carcinoma thyroid & external radiation is used in treatment of anaplastic cancer thyroid.Q