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
In a typical blood gas analyser 
Select and explain. 
A. Oxygen tension will be overstimulated in hypothermia, B. pH is a derived measurement, C. Standard bicarbonate can be used to indicate the respiratory component, D. The oxygen tension can be measured using Clarke electrode.
D: The oxygen tension can be measured using Clarke electrode.
Answer: D: The oxygen tension can be measured using Clarke electrode. 
Explanation: Oxygen tension falls with hypothermia. The pH electrode directly measure pH. The standard bicarbonate measured in sample titrated to pCO2 of 5.3 kPa, which eliminates respiratory component.