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': 'Reactive ahritis is a result of exposure to all of the following, EXCEPT: \nSelect and explain. \nA. Chlamydia species, B. Campylobacter jejuni, C. Salmonella enteritidis, D. None of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Reactive ahritis is an inflammatory condition that occurs after exposure to ceain gastrointestinal and genitourinary infections, paicularly Chlamydia species, Campylobacter jejuni, Salmonella enteritidis, Shigella, and Yersinia. Patients may give a history of an antecedent genitourinary or dysenteric infection 1 to 4 weeks before the onset of ahritis. Only a minority of these patients have the findings of classic reactive ahritis, including urethritis, conjunctivitis, uveitis, oral ulcers, and rash. Studies have identified microbial DNA or antigen in synol fluid or blood, but the pathogenesis of this condition is poorly understood. Ref: Madoff L.C. (2012). Chapter 334. Infectious Ahritis. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo (Eds), Harrison's Principles of Internal Medicine, 18e.", 'role': 'assistant'}]