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
Which of the following is used to measure the depth of anesthesia - 
Select and explain. 
A. Bispectral index, B. Immobility of patient, C. MAC of anesthetic drug, D. None
A: Bispectral index
Answer: A: Bispectral index 
Explanation: 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