This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'A patient presents with respiratory distress and shows pH = 7.2, PCO2 = 50 mmHg, PO2 = 85 mmHg and HCO3 = 20 mEq/L. The cause is \nSelect and explain. \nA. Metabolic acidosis, B. Metabolic alkalosis, C. Respiratory acidosis with compensatory Metabolic alkalosis, D. Respiratory acidosis with decompensatory Metabolic acidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Respiratory acidosis with decompensatory Metabolic acidosis PREDICTION OF COMPENSATORY RESPONSES ON SIMPLE ACID-BASE DISTURBANCESDisorderPrediction of Compensation* Metabolic acidosisPaco2 = (1.5 x HCO3-) + 8OrPaco2 will | 1.25 mmHg per mmol/L |in orPaco2 = + 15* Metabolic alkalosisPaco2 will | 0.75 mmHg per mmol/L | in Paco2 will | 6 mmHg per mmol/L | in Paco2 = + 15* Respiratory alkalosis * Acute will | 2 mmol/L per 10 mmHg |, in Paco2* Chronic will|4 mmol/L per 10 mmHg | in Paco2* Respiratory acidosis * Acute will | 1 mmol/L per 10 mmHg | in Paco2* Chronic will | 4 mmol/L per 10 mmHg | in Paco2', 'role': 'assistant'}]