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: ENT
[{'content': 'Neck nodes are commonly seen with occult primary in - \nSelect and explain. \nA. Nasopharyngeal carcinoma, B. Papillary carcinoma of thyroid, C. Medullary carcinoma of thyroid, D. Bronchogenic carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]