This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gas Transport, Subject name: Physiology
Co2 causes? 
Select and explain. 
A. Decrease respiratory drive, B. Reduces cerebral blood flow, C. Depresses vasomotor centre, D. Respiratory stimulation by central chemoreceptc
D: Respiratory stimulation by central chemoreceptc
Answer: D: Respiratory stimulation by central chemoreceptc 
Explanation: ANSWER: (D) Respiratory stimulation by central chemoreceptorsREF: Ganong's 22nd ed chapter 31Co2 causes direct stimulation of vasomotor centre