This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Congenital dacrocystitis, the block is at- \nSelect and explain. \nA. Lacrimal calnaliculi, B. Nasolacrimal duct, C. Punctum, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Also known as dacryocystitis neonaturum. Due to congenital blockage in the nasolacrimal duct. Ref: ak khurana 6th edition REF IMG', 'role': 'assistant'}]