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: Medicine
Patient had loss of temporal field of vision in right eye and nasal field of vision in the left eye. The possible site of lesion is 
Select and explain. 
A. Optic chiasma, B. Left optic tract, C. Right optic radiation, D. Left optic nerve
B: Left optic tract
Answer: B: Left optic tract 
Explanation: None