This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'In the second stage of anaesthesia the pupil is – \nSelect and explain. \nA. Constricted, B. Partially dilated, C. Normal in size, D. Totally dilated', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stage 1 → Pupil size normal\nStage 2 → Partially dilated\nStage 3 → Plane 1 → normal size, Plane 2 → 1/2 dilated, Plane 3 → 3/4 dilated, Plane 4 → fully dilated.\nStage 4 → Fully dilated & fixed', 'role': 'assistant'}]