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': 'Nodal Metastases is absent in: \nSelect and explain. \nA. Supraglottic carcinoma, B. Glottic carcinoma, C. Subglottic carcinoma, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: As vocal cord is free of lymphatics, nodal metastasis is rase in Glottic carcinoma.', 'role': 'assistant'}]