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: Medicine
Respiratory acidosis is characterized by - 
Select and explain. 
A. Raised PCO2 and elevated pH, B. Decreased plasma HCO3 and decreased PCO2, C. Increased PCO2 and decreased pH, D. Decreased pH and decreased PCO2
C: Increased PCO2 and decreased pH
Answer: C: Increased PCO2 and decreased pH 
Explanation: None