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': 'Increased alveolar O2 concentration is due to which of the following condition? \nSelect and explain. \nA. Intra cardiac right to left shunt, B. Asthma, C. Pulmonary hemorrhage, D. Ventilation perfusion mismatch', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A high V/Q ratio increases paO2 and decreases paCO2. This finding is typically associated with pulmonary embolism (where blood circulation is impaired by an embolus). A high V/Q can also be observed in COPD as a maladaptive ventilatory overwork of the undamaged lung parenchyma. In Asthma and Pulmonary hemorrhage there is decreased O2 concentration.', 'role': 'assistant'}]