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: Medicine
[{'content': 'A 30 year old patient presents with odynophagia, there no h/o drug intake. On endoscopy there are multiple ulcers in the esophagus diagnosis is \nSelect and explain. \nA. Cytomegalo virus infection, B. Herpes simplex virus infection, C. Candidiasis, D. Achalasia.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]