This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
Peripheral & central chemoreceptors may both contribute to increased ventilation that occurs as a result of decreased 
Select and explain. 
A. Aerial BP, B. Aerial tension, C. Aerial O2 concentration, D. H+
D: H+
Answer: D: H+ 
Explanation: The central chemoreceptors monitor the H+ concentration of cerebrospinal fluid (CSF), including the brain interstitial fluid.The receptors in the carotid and aoic bodies(peripheral chemoreceptors) are stimulated by a rise in the PCO2 or H+ concentration of aerial blood or a decline in its PO2.Ref: Ganong's Review of Medical Physiology, Twenty-Third Edition, Page number: 627, 628