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
Lesion in the optic chiasma causes -a) Bitemporal hemianopiab) Upper nasalc) Lower nasald) Upper temporale) Lower temporal 
Select and explain. 
A. acd, B. bde, C. ade, D. ad
C: ade
Answer: C: ade 
Explanation: Central lesions of optic chiasma


Characteristic visual field defect → Bitemporal hemianopia


Initially temporal quadrantanopia may occur :-


Lesion compressing from below → upper temporal
Lesion compressing from above → lower temporal

Lateral lesions of optic chiasma → Binasal hemianopia