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: Skin
[{'content': 'Jarisch Herxheimer reaction is commonly seen in: \nSelect and explain. \nA. Early syphilis, B. Late congenital syphilis, C. Latent syphilis, D. Syphilis of cardiovascular system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Early syphilis Jarisch - Herxheimer - Reaction, consisting of fever & constitutional symptoms may follow the treatment of syphilisQ most commonly in secondary syphilis > primary syphilis > Early latent syphilis.', 'role': 'assistant'}]