In a patient presenting with headache and eye complaints, Examination of right eye reveals: Right eye superotemporal quadrantanopia. Left eye reveals: Left eye superotemporal quadrantanopia, Left eye centrocecal scotoma. Likely site of lesion is -
The patient has :-


Right superotemporal quadrantanopia
Left superotemporal quadrantanopia
Left centrocecal scotoma → Left optic nerve involvement e.g. toxic opic neuropathy


It has also been explained that early central chiasmatic lesion due to pituitary adenoma can cause upper temporal quadrantanopia.
So, best answer here is 'a' i.e. left optic nerve with optic chiasma.
Left optic nerve + chiasma
Left optic tract + chiasma
Right optic nerve + chiasma
Right optic tract + chiasma