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: Physiology
Central Chemoreceptors are mot sensitive to following changes in blood: 
Select and explain. 
A. TPCO2, B. i,PCO2, C. TH', D. TP02
A: TPCO2
Answer: A: TPCO2 
Explanation: A i.e. TPCO2