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
During neonatal resuscitation, when should chest compression be started and what is the ideal ratio of chest compression to ventilation 
Select and explain. 
A. Heart rate < 60 /min; 30:2, B. Heart rate < 100 / min; 2:1, C. Heart rate < 100 / min; 15:1, D. Heart rate <60/min; 3:1
D: Heart rate <60/min; 3:1
Answer: D: Heart rate <60/min; 3:1 
Explanation: During neonatal resuscitation, chest compression is started when heart rate < 60 /Min.
Ratio of chest compression to ventilation is 3:1 (90 compression : 20 breath)