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
[{'content': 'pH=7.28, PaCO2=70, Condition is consistent with: March 2005 \nSelect and explain. \nA. Metabolic acidosis, B. Metabolic alkalosis, C. Respiratory acidosis, D. Respiratory alkalosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Respiratory acidosis Normal Systemic aerial pH is between 7.35-7.45 and steady state PaCO2 is 40 mm Hg. Disorders and range of values for pH and PaCO2 Metabolic acidosis-Low pH and low PaCO2 Metabolic alkalosis-High pH and high PaCO2 Respiratory acidosis-Low pH and high PaCO2 Respiratory alkalosis-High pH and low PaCO2', 'role': 'assistant'}]