A mother brings her 18 month old son to your office. She was called by her day care center who reported he had vomited twice during the morning and had diarrhea as well. She noted he had a slight fever the past 2 days and had not been very hungry. The most likely cause of his illness was (A) Adenovirus (B) Astrovirus (C) Norovirus (D) Rotavirus

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