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: Unknown
[{'content': 'Grading of carcinoma epiglottis involving pre-epiglottic space will be: \nSelect and explain. \nA. T3 stage, B. T2 stage, C. T1 stage, D. T4 stage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: PL Dhingra, Textbook of Ear, Nose, Throat, 6th edition, pg no: 308)\nTumor staging of Supraglottic cancer', 'role': 'assistant'}]