This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnostic and operative ENT, Subject name: ENT
[{'content': 'In antral lavage, approach is through \nSelect and explain. \nA. Medial wall, B. Roof, C. Posterior wall, D. Canine fossa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: This procedure involves puncturing the medial wall of maxillary sinus in the region of inferior meatus and irrigating the sinus. Antral Puncture- Ref- Dhingra, 6th edition, page 408.', 'role': 'assistant'}]