<prompt> Most common histological type of thyroid carcinoma isFollicular typePapillary typeAnaplastic typeMedullary type  <response>: B Papillary type Morphological variants of thyroid carcinoma and their approximate frequencies are: Papillary carcinoma 75-85 Follicular carcinoma 10-20 Medullary carcinoma 5 Anaplastic carcinoma 5 Histology type Incidence Papillary 80 Follicular 10 Medullary 5 Anaplastic 1 Papillary carcinoma thyroid: Commonest carcinoma of thyroid gland 80 Commonest carcinoma in iodine sufficient area. More common in patients with previous exposure to radiation past childhood Commonest age 30-40 year. Multifocal more common Lymph node metastases more common i.e., lymphatic spread Distant metastasis uncommon commonest site - lung followed by bone, liver, brain. Prognosis excellent -10 years survival 95 