This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
[{'content': 'Kappa angle is the angle between the \nSelect and explain. \nA. Pupillary axis and visual axis, B. Centre of eyeball rotation and line of fixation, C. Visual axis and optical axis, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angle kappa: It is the angle formed between the visual axis and pupillary line. Reference :- A K KHURANA; pg num:-27', 'role': 'assistant'}]