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': 'Definitive sign of phase I of anaesthesia is – \nSelect and explain. \nA. Fixation of eyeball, B. Pupillary dilatation, C. Blurring of vision, D. Intercostal paralysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Plane 1 (Phase 1) of stage III ends when eye balls become fixed.', 'role': 'assistant'}]