This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Cone of light focuses on which quadrant of tympanic membrane \nSelect and explain. \nA. Anteroinferior, B. Posteroinferior, C. Anterosuperior, D. Posterosuperior', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A bright cone of light radiating from tip of malleus to the periphery in the anteroinferior quadrant of the tympanic membrane Ref: Dhingra 6th edition', 'role': 'assistant'}]