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: Anaesthesia
[{'content': 'For any anesthetics, the basic standards of monitoring include a continuous evaluation of all except \nSelect and explain. \nA. Hematocrit, B. Circulation, C. Ventilation, D. Oxygenation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The basic monitoring standards of the American Society of Anesthesiologists states that "the patient\'s oxygenation, ventilation, circulation, and temperature shall be continually evaluated.', 'role': 'assistant'}]