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: Ophthalmology
Right homonymous hemianopia is caused by lesion of: September 2012 
Select and explain. 
A. Left optic radiation, B. Right geniculate body, C. Right optic nerve, D. Right optic radiation
A: Left optic radiation
Answer: A: Left optic radiation 
Explanation: Ans. A i.e. Left optic radiation Visual field defects Homonymous hemianopia: Lesions of optic tract (incongruous defects) Homonymous quadrantaopia: Lesion of temporal lobe (superior) Bitemporal hemianopia: Lesions of optic chiasm