<prompt> Most common thyroid Cancer isPapillary carcinomaFollicular carcinomaMedullary carcinomaAnaplastic carcinoma  <response>: 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 