<prompt> The most common histologic type of thyroid cancer is -Medullary typeFollicular typePapillary typeAnaplastic type  <response>: Ans. is c i.e., Papillary type Ref: Schwartz 9e p1361 8e p1417; Harrison 17e p.2242 16e, p.2122o Papillary carcinoma accounts for 80 of ail thyroid malignancies in iodine-sufficient areas and is the predominant thyroid cancer in children and individuals exposed to external radiation. - Schwartzo Incidence of primaiy malignant tumors of thyroid gland Harrison 17eType of thyroid carcinomaApproximate PrevalencePapillary Carcinoma80-90Follicular Carcinoma5-10Medullary Carcinoma10Anaplastic CarcinomaRareLymphomas1-2o Also remembery Thyroid carcinoma is the most common malignancy of the endocrine system Ref: Harrison, 17e, p 2243 