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': 'According to the latest evidence the latent virus infection which is responsible for the pathogenesis of the achalasia is: \nSelect and explain. \nA. Herpes simplex 1, B. Hepatitis C infection, C. Rubella, D. Measles', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is believed that cause of ganglion cell degeneration in achalasia is an autoimmune process attributable to a latent infection with human herpes simplex virus 1 combined with genetic susceptibility. Ref: Harrison, Edition-18, Page-2431.', 'role': 'assistant'}]