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: Anaesthesia
Capnography basically monitors - 
Select and explain. 
A. Central venous pressure, B. Blood pressure during anesthesia, C. Concentration of exhaled CO2, D. Concentration of inhaled O2
C: Concentration of exhaled CO2
Answer: C: Concentration of exhaled CO2 
Explanation: Capnography is the continuous measurement of end-tidal CO2 (ETCO2), i.e. the CO2 in expired air.