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': "A 56-year-old man has painful weeping rashes over the upper eyelid and forehead for the last 2 days along with ipsilateral acute punctuate keratopathy. About a year back, he had chemotherapy for Non-Hodgkin's lymphoma. There is no other abnormality. Which of the following is the most likely diagnosis? \nSelect and explain. \nA. Impetigo, B. Systemic Lupus Erythematosus, C. Herpes Zoster, D. Pyoderma gangrenosum", 'role': 'user'}, {'content': "Answer: C \nExplanation: It is a case of infection with Herpes Zoster.\nThe point which leaves no doubt about the diagnosis of Herpes zoster\n\n\nPainful (unilateral) rashes over upper eyelid and forehead\nH/O chemotherapy for Non-hodgkin's lymphoma\nIpsilateral acute punctate keratopathy\n\n\nHerpes infections are characterized by pain and its occurrence in an immunocompromised patient.\nPatients with Hodgkin's disease and Non-Hodgkins lymphoma are at great risk of developing progressive herpes zoster.", 'role': 'assistant'}]