This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elementary Optics, Subject name: Ophthalmology
Angle kappa is formed between which axes? 
Select and explain. 
A. Anatomical and visual axis, B. Anatomical and horizontal axis, C. Between two visual axes, D. Visual axis and vertical axis
A: Anatomical and visual axis
Answer: A: Anatomical and visual axis 
Explanation: Ans. (a) Anatomical and visual axisRef: Kanski's 7/e, chapter 18