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
Which of the following is predisposing factor for papillary carcinoma of thyroid? 
Select and explain. 
A. Irradiation, B. Thyroglossal cyst, C. Hashimoto’s thyroiditis, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None