This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Medicine
[{'content': 'Interpret the following ABG values: PcCo2 - 40, HCO3 - 55 mEq/L and pH - 7.7:- \nSelect and explain. \nA. Uncompensated metabolic alkalosis, B. Mixed respiratory and metabolic acidosis, C. Combined respiratory and metabolic acidosis, D. Compensated respiratory acidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]