This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Which of the following disease show centrifugal spread of rash \nSelect and explain. \nA. Dengue, B. Small pox, C. Rocky mountain fever, D. Erythema multifotme', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Description of rashes Deep seated All rashes in an area appeared in one stage, evolution was slow scentrifugal distribution - palm and sole and extensor surface were affected first. Fever subsided with appearance of rash. Ref: essentials of Medical microbiology apurba sastry 1st edition', 'role': 'assistant'}]