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
In a child with cardiopulmonary arrest, intraosseous access should be attempted, if venous access is not available within: 
Select and explain. 
A. 1 minute, B. 2 minutes, C. 3 minutes, D. 5 minutes
A: 1 minute
Answer: A: 1 minute 
Explanation: 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