This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Anesthesia, Subject name: Anaesthesia
[{'content': 'Which of the following is used to measure the depth of anesthesia - \nSelect and explain. \nA. Bispectral index, B. Immobility of patient, C. MAC of anesthetic drug, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Bispectral index Methods of monitoring the depth of anesthesia* Monitoring of depth of anesthesia is done mainly clinically1. Bispectal index2. Tachycardia3. Hypertension4. Lacrimation5. Perspiration (sweating)6. Eye movement7. Preserved reflexes (coughing)8. Movement on painful stimuli9. Laryngospasm / Bronchospasm10. Tachypnea11. P waves on EEG12. Evoked responses", 'role': 'assistant'}]