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
In the second stage of anaesthesia the pupil is – 
Select and explain. 
A. Constricted, B. Partially dilated, C. Normal in size, D. Totally dilated
B: Partially dilated
Answer: B: Partially dilated 
Explanation: Stage 1 → Pupil size normal
Stage 2 → Partially dilated
Stage 3 → Plane 1 → normal size, Plane 2 → 1/2 dilated, Plane 3 → 3/4 dilated, Plane 4 → fully dilated.
Stage 4 → Fully dilated & fixed