This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Pathology
[{'content': 'Most common histological type of thyroid carcinoma is \nSelect and explain. \nA. Follicular type, B. Papillary type, C. Anaplastic type, D. Medullary type', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (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%)', 'role': 'assistant'}]