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: Physiology
[{'content': 'In hyperventilation: \nSelect and explain. \nA. P50 and Hb affinity for O2 increases, B. P50 and Hb affinity for O2 decreases, C. P50 increases and O2 affinity decreases, D. P50 decreases and O2 affinity increases', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hyperventilation washes out CO2\xa0from body, leadng\xa0to\xa0alkalosis.So, Oxygen hemoglobin dissociation\xa0 curve\xa0will\xa0 shift\xa0 to\xa0 left\xa0 (high\xa0 affinity),\xa0decreasing\xa0P50 of hemoglobin.\nReference: Ganong’s Review of Medical Physiology 24th edition pg 611', 'role': 'assistant'}]