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': 'Hoarseness of voice occurs early in - \nSelect and explain. \nA. Glottic Ca, B. Subglottic Ca, C. Supraglottic, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]