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': 'Best medium to transport an avulsed tooth, which is not to be reimplanted immediately: \nSelect and explain. \nA. Viaspan, B. HBSS, C. Coconut water., D. Milk.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]