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': 'ABG analysis of a patient on ventilator,shows decreased pCO2, normal pO2, pH 7.5; diagnosis is: \nSelect and explain. \nA. Respiratory acidosis, B. Metabolic alkalosis, C. Resp alkalosis, D. Metabolic acidosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Respiratory akalosis) : There is alkalosis (pH = 7.5) and CO2 is low (alkalosis). Change in CO2 is inkeeping with change in pH and thus the primary cause is respiratory. The acid base disturbance is thus primary respiratory alkalosis.', 'role': 'assistant'}]