Correct choice is (d) Moisture content of the exhaled air
Easiest explanation: When a person goes for surgery, certain conditions need to be maintained. They include the blood pressure, blood sugar, pulse oximetry, electrocardiography etc. The moisture content of the exhaled air, though important, but it does not affect anesthesia. If the moisture content falls below, the ventilator adjusts it automatically but the other parameters all need to be monitored by the doctors.