This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
In Pediatric age group, the most common feature of polytrauma is 
Select and explain. 
A. Hypothermia, B. Hypotension, C. Hypovelomic shock, D. Hypoxemia
A: Hypothermia
Answer: A: Hypothermia 
Explanation: As the surface area to body volume ratio of children is high, thermal energy loss is higher and hypothermia is a higher risk. Due to the greater physiological capacity and ability of children to compensate for the fluid loss, hypotension is a very late and ominous sign of hypovolaemic shock.