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 
Select and explain. 
A. Bitemporal hemianopia, B. Upper nasal, C. Lower nasal, D. Upper temporal
A: Bitemporal hemianopia
Answer: A: Bitemporal hemianopia 
Explanation: A i.e. Bitemporal hemianopia