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': "Hutchinson's rule is related to ? \nSelect and explain. \nA. Herpes simplex keratitis, B. Mycotic keratitis, C. Herpes zoster ophthalmicus, D. None", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Herpes zoster ophthalmicus Hutchinson's rule : - In herpes zoster ophthalmicus, involvement of the tip of nose, supplied by external nasal nerve (a terminal branch of nasociliary nerve), signifies increase risk of ocular involvement (uveitis).", 'role': 'assistant'}]