This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid & Electrolyte, Subject name: Pediatrics
[{'content': 'In a child with cardiopulmonary arrest, intraosseous access should be attempted, if venous access is not available within: \nSelect and explain. \nA. 1 minute, B. 2 minutes, C. 3 minutes, D. 5 minutes', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. 1 minute(Ref: Nelson's 20/e p 523-528, Ghai 8/e p 715-718)If venous access is not available within 1 minute in a child with cardiopulmonary arrest, an IO needle should be placed in anterior proximal tibia", 'role': 'assistant'}]