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': 'After 3 days of fever a patient developed macular erythematous rash that lasted for 48 hrs on the 4th day of fever. The most likely diagnosis is: \nSelect and explain. \nA. Fifth disease, B. Rubella, C. Measles, D. Roseola infantum', 'role': 'user'}, {'content': "Answer: D \nExplanation: Exanthem subitum/roseola infantum/6th disease is due to infection by HHV - 6. It is characterised by fever and subsequent rash. Approximately 10-20 % febrile seizures without rash are caused by HHV-6. Ref: Harrison's Principles of Internal Medicine, 14th Edition, Page 1159 and 15th Edition, Page 96", 'role': 'assistant'}]