This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Hutchinson's rule is related to - 
Select and explain. 
A. Herpes simplex keratitis, B. Mycotic keratitis, C. Herpes zoster ophthalmicus, D. None
C: Herpes zoster ophthalmicus
Answer: C: Herpes zoster ophthalmicus 
Explanation: Hutchinson's rule is related to herpes zoster ophthalmicus which is an acute infection of Gasserian ganglion of the fifth cranial nerve by the varicella zoster virus.Occurs commonly in immunocompromised individuals.Hutchinson's rule implies that ocular involvment is frequent if the side or tip of the nose presents vesicles is useful but not infallibleReference:Comprehensive ophthalmology,AK Khurana,6th edition,page no.110