This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
[{'content': 'True stereopsis is perceived due to the following - \nSelect and explain. \nA. Overlay of contours, B. Motion parallax, C. Bi- nasal disparity, D. Linear perspective', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stereopsis is a term that is most often used to refer to the perception of depth and 3-dimensional structure obtained on the basis of visual information deriving from two eyes by individuals with normally developed binocular vision. It is used for binasal disparity Ref khurana 6/e p456', 'role': 'assistant'}]