This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
A 4 month old child can be given clear fluid till how many hours prior to Sx 
Select and explain. 
A. 1 hr, B. 2 hrs, C. 3 hrs, D. 4 hrs
B: 2 hrs
Answer: B: 2 hrs 
Explanation: Pre Procedure fasting guidelines Ingested material Minimum fasting period (h) Clear liquids 2 Breast milk 4 Infant formula 6 Non - human milk 6 Adapted from American Society of Anesthesiologists task force on sedation and analgesia by non - anesthesiologists. Practice guidelines for sedation and analgesia by non - anesthesiologists. British and Ireland society of Anesthesiologist.This has been upgraded with one change now clear fluid requires NPO of 1 hr. Recently no. of studies have shown more liberal approach showed positive results. Thus nil per oral status for pediatrics is decreased from 2hrs to 1 hr. ASA still has not upgraded from 2 hrs to 1 hr for NPO for clear fluid.