This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
[{'content': 'Most common thyroid Cancer is \nSelect and explain. \nA. Papillary carcinoma, B. Follicular carcinoma, C. Medullary carcinoma, D. Anaplastic carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Papillary carcinoma of thyroid: - constitutes >85% of all thyroid carcinoma - occurs due to mutation of genes encoding: *RET gene *NTRK1 receptor tyrosine kinases *BRAF gene These tumours may be solitary or multivocal. On microscopy: - branching papillae with fibrovascular stalk lined by cuboidal epithelium - nuclei of cells are optically clear with dispersed chromatin and has Orphan Annie eye nuclei (Ref : ROBBINS Text book of pathology) REF IMG', 'role': 'assistant'}]