This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Monitoring in Anesthesia, Subject name: Anaesthesia
During CPCR in ACLS the waveform of capnograph shows following change. This indicates:- 
Select and explain. 
A. Return of spontaneous circulation, B. Inadequate ventilation, C. Inadequate metabolism, D. Check position of Endotracheal tube
A: Return of spontaneous circulation
Answer: A: Return of spontaneous circulation 
Explanation: capnography is now an essential monitor in ACLS .