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: Dental
[{'content': 'A 9 year old female patient complains of pain and bleeding in  upper front teeth region and gives a history of fall while playing an hour ago. Intra-oral examination reveals bleeding and avulsion of maxillary right central incisor. Which is the better media for maintaining the PDL viability of this tooth? \nSelect and explain. \nA. Pasteurized bovine milk, B. Tap water, C. Gatorade, D. Coconut water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: If the parent cannot or will not replant it, the tooth must be kept moist during the trip to the dental office.\xa0Allowing the avulsed tooth to dehydrate before replantation is damaging to a favorable prognosis. Hanks’ buffered\xa0saline, isotonic saline, and pasteurized bovine milk may be the most favorable known storage media. Although tap\xa0water has been a commonly recommended storage solution (and its use would be preferable to dehydration of\xa0the tooth), it is hypotonic, and its use leads to rapid cell lysis and increased inflammation on replantation.', 'role': 'assistant'}]