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': 'Epiphora is : \nSelect and explain. \nA. Cerebrospinal fluid running from the nose after fracture of anterior cranial fossa, B. An epiphenomenors of a cerebral tumor, C. An abnormal overflow of tears due to obstruction of lacrimal duct, D. Eversion of lower eyelid following injury', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Abnormal overflow of tears due to obstruction of lacrimal duct', 'role': 'assistant'}]