This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Bank & Transfusion Therapy, Subject name: Medicine
[{'content': 'Platelets transfusion must be completed in: \nSelect and explain. \nA. 15 minutes, B. 30 minutes, C. 90 minutes, D. 120 minutes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Once the bag is opened by puncturing one of the sealed pos, the platelets must be administered within 30 minutes.', 'role': 'assistant'}]