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: Ophthalmology
[{'content': 'Valve of Rosenmuller is present in which pa of lacrimal system? \nSelect and explain. \nA. Puncta, B. Canaliculi, C. Lacrimal sac, D. Nasolacrimal duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. CanaliculiValve of Rosenmuller is a small flap of mucosa in lacrimal canaliculus at its junction with lacrimal sac.', 'role': 'assistant'}]