This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
Patient treated previously by irradiation to neckdevelops a single solitary nodule- 
Select and explain. 
A. Papillary ca thyroid, B. Follicular CA thyroid, C. Medullary CA, D. Hurthle cell CA
A: Papillary ca thyroid
Answer: A: Papillary ca thyroid 
Explanation: Ans. is 'a' i.e., Papillary CA thyroid