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: Physiology
[{'content': 'Valve of Hasner is present at \nSelect and explain. \nA. Stensons duct, B. Common bile duct, C. Naso lacrimal duct, D. Maxillary Sinus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]