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: Pediatrics
A 6 months old child having severe dehydration comes to the casualty with weak pulse and unrecordable B.P. Repeated attempt in gaining I.V. access has failed – The next best step is – 
Select and explain. 
A. Try again, B. Jugular vein catheterization, C. Intra osseus I.V. fluids, D. Venesection
C: Intra osseus I.V. fluids
Answer: C: Intra osseus I.V. fluids 
Explanation: "If I.V. route is unsuccessful, introasseus access in the proximal tibia of an uninjured leg is the preferred alternative for children younger than 6 yrs. In children older than 6 yrs a percutaneous femoral venous line should be attempted.