This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-Ophthalmology, Subject name: Ophthalmology
Incongruous homonymous hemianopia is caused by lesion in the 
Select and explain. 
A. Optic tract, B. Optic chiasma, C. Optic nerve, D. Optic radiation
A: Optic tract
Answer: A: Optic tract 
Explanation: A. (Optic tract) (290 - Khurana 4th)* Incongrous homonymous hemianopia - caused by lesion in the optic tract* Congruous homonymous hemianopia - caused by lesion in the visual cortexLESIONS OF THE VISUAL PATHWAYSite of lesionManifestations ;; Optic nerve- Complete blindness on affected side associated with abolition of the direct light reflex on the I/L and consensual on the C/L side, Near (accommodation) reflex is present Central lesion of the chiasma .- * Bitemporal hemianopia and bitemporal hemianopic paralysis of pupillary reflexes Lateral chiasmal lesions- Binasal hemianopia associated with binasal hemianopic paralysis of the pupillary reflexes Optic tract- * Incongruous homonymous hemianopia associated with C/L hemianopic pupillary reaction (Wernicke's reaction) Lateral geniculate body- Homonymous hemianopia with sparing of pupillary reflexes Optic radiation- Complete homonymous hemianopia Inferior quadrantic hemianopia (pie on the floor)- Superior quadrantic hemianopia (pie in the sky)[G1 Visual cortex- Congruous homonymous hemianopia