This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Viral Diseases in Children, Subject name: Pediatrics
[{'content': 'Which of the following is characteristic of the rash of measles: \nSelect and explain. \nA. Begins as a maculopapular rash, then becomes vesicular, B. "Slapped cheek" appearance and lacy reticular pattern, C. Pustules on an erythematous base, D. Maculopapular eruption staing on upper trunk and spreading downward', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Characteristic of the rash of measles: Maculopapular eruption staing on upper trunk and spreading downward Begins as a maculopapular rash, then becomes vesicular- seen in chicken pox "Slapped cheek" appearance and lacy reticular pattern- seen in Erythema infectiosum', 'role': 'assistant'}]