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
Bitemporal hemianopia is characteristic of ? 
Select and explain. 
A. Glaucoma, B. Optic neuritis, C. Pituitary tumor, D. Retinal detachment
C: Pituitary tumor
Answer: C: Pituitary tumor 
Explanation: Ans. is 'c' i.e., Pituitary tumor Characteristic visual field defect of central chiasmatic lesion is bitemporal hemianopia. Pituitary tumor causes central chiasmatic lesion. Bitemporal hemianopia results due to central (sagittal) lesion of the optic chiasma, common causes of which are tumors of the pituitary gland (most common), craniopharyngioma, suprasellar meningioma, glioma of third ventricle, chiasmal arachnoiditis, and third ventricular dilatation.