This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
Size of LMA used for 25kg child is 
Select and explain. 
A. 1, B. 1.5, C. 2.5, D. 4
C: 2.5
Answer: C: 2.5 
Explanation: Size of LMA used for a 25 kg child is 2.5 LMA size 6 is used in adults weighing over 100 kg