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: Dental
[{'content': 'A 45 year old male has multiple grouped vesicular lesions present on the TN segment dermatome associated with pain. The most likely diagnosis is \nSelect and explain. \nA. Herpes zoster, B. Dermatitis herpetiformis, C. Herpes simplex, D. Scabies', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Painful vesicles along the distribution of a dermatome suggest the diagnosis of Herpes zoster.', 'role': 'assistant'}]