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': 'Metastasis in thyroid gland come most commonly from carcinoma of \nSelect and explain. \nA. Testis, B. Prostate, C. Breast, D. Lungs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The above-mentioned book is solely dedicated to surgery and diseases of thyroid & parathyroid gland.\n\nIt writes -\n"Metastatic disease to the thyroid may occur as a consequence of direct extension from upper aerodigestive malignancies, i.e., squamous cell Ca, or by hematogenous spread. Evidence at autopsy has demonstrated upto 20% of patients exhibiting distant metastasis to the thyroid gland from breast, lung, kidney, & melanoma skin most commonly."', 'role': 'assistant'}]