<prompt> Which of the following is the most common cancer of thyroidAnaplastic carcinomaFollicular carcinomaPapillary carcinomaMedullary carcinoma  <response>: Papillary carcinoma is the most common malignancy of thyroid, accounts to 70-80 of all thyroid malignancies. It has the best prognosis of all thyroid cancers. Source : Sabiston 20th edition pg : 900 