This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Tumor, Subject name: Pathology
[{'content': 'Orphan Annie eye nuclei appearance is characteristic of: \nSelect and explain. \nA. Papillary carcinoma thyroid, B. Carcinoma pituitary, C. Paraganglioma, D. Meningioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - Nuclei of papillary carcinoma cells contain finely dispersed chromatin, which impas an optically clear or empty appearance of nuclei, giving rise to designation ground-glass or Orphan Annie eye nuclei.', 'role': 'assistant'}]