This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Carcinoma thyroid with blood-borne metastasis is- \nSelect and explain. \nA. Follicular, B. Papillary, C. Mixed, D. Medullary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: As already explained above\n\nPapillary spreads mainly by →\xa0lymphatics\nFollicular spreads mainly by → hematogenous\nAnaplastic spreads mainly by → direct (lymphatic and blood-borne spread is also seen)\nMedullary spreads mainly by → lymphatics\n\nAlso Remember\n\n"The most common sites of blood-borne metastasis are lung, bones and brain. Lung involvement is more frequent in papillary carcinoma, while bone involvement is more common in follicular thyroid Ca."\n\nEndocrine surgery of head & neck by Phillip K. Pellitteri & Thomas V. McCaffrey', 'role': 'assistant'}]