This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inhalational Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'All of the following decreases mean alveolar concentration (MAC) except: \nSelect and explain. \nA. Hypoxia, B. Hypercapnia, C. Hypothyroidism, D. Hypovolemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: MAC can be affected by several physiological and pharmacological variables: Endocrine disorders does not affect MAC. MAC | ed MAC | ed Hypoxia Hypercapnia Hypovolemia Hypothermia Hypehermia >42 degree Hypercalcemia Hyponatraemia Hypernatraemia', 'role': 'assistant'}]