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. 7.2 PO2 mm Hg 50 mm Hg, HCO3– 13, the values goes in favour of - \nSelect and explain. \nA. Respiratory acidosis, B. Metabolic alkalosis, C. Respiratory alkalosis, D. Both respiratory and metabolic acidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In this patient\nPH →Decreased (N → 7.4)\nPCO2 → Increased (N-40 mm Hg)\nHCO3- →Decreased (N-24 mmol/L)\nFirst step\n\nDetermine whether alkalosis or acidosis is present\nDecreased pH indicates acidosis\n\nSecond step\n\nInspect the HCO3- / CO2 to determine the cause of acidosis\nHere both the abnormalities are in sync with a decrease in pH\n\nIncrease in CO2 → Produces acidosis (respiratory)\nThe decrease in HCO3- → Produces acidosis (metabolic)\n\nThere is no compensatory response\nIt can be easily concluded, that it is a case of mixed respiratory acidosis together with metabolic acidosis\nThe other very simple way to detect these mixed disorders is to observe the HCO3-/CO2 ratio.\nHCO3-/CO2 ratio moves in the opposite direction\nThere is no need to proceed to the third step.', 'role': 'assistant'}]