This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Applied Aspects and Respiratory Adjustments, Subject name: Physiology
[{'content': 'During under water diving the main danger is due to? \nSelect and explain. \nA. Oxygen and nitrogen, B. CO, and nitrogen, C. Oxygen only, D. Nitrogenonly', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) Oxygen and nitrogenREF: Ganongs 22nd ed chapter 37Indirect repeat from December 2010POTENTIAL PROBLEMS ASSOCIATED WITH EXPOSURE TO INCREASED BAROMETRIC PRESSURE UNDER WATER:Oxygen toxicityLung damage, ConvulsionsNitrogen narcosisEuphoria, Impaired performanceHigh-pressure nervous syndromeTremors, SomnolenceDecompression sicknessPain, ParalysesAir embolismSudden death', 'role': 'assistant'}]