This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
[{'content': 'Orphan-Annie-eyed nuclei are seen in: \nSelect and explain. \nA. Papillary carcinoma, B. Follicular carcinoma, C. Anaplastic carcinoma, D. Medullary carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Papillary carcinoma): Ref: 798-LB (793-B &L 25th)* Histologically the papillary carcinoma shows papillary projections and characteristic pale, empty nuclei (Orphan-Annie - eyed nuclei)* Papillary carcinoma is the most common of the thyroid neoplasms and is usually associated with an excellent prognosis* The association of irradiation and thyroid cancer has been known usually papillary carcinoma* Psammoma bodies is diagnostic of papillary carcinoma', 'role': 'assistant'}]