This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lesions of the Visual Pathway, Subject name: Ophthalmology
Visual field defect in a woman with pituitary adenoma compressing the optic chiasma 
Select and explain. 
A. Homonymous hemianopia, B. Bitemporal hemianopia, C. Bi nasal hemianopia, D. Quadrantanopia
B: Bitemporal hemianopia
Answer: B: Bitemporal hemianopia 
Explanation: Ref: Kanski: Clinical Ophthalmology; 7th edition.Explanation:Normal chiasmal position is seen in 80%Prefixed chiasma - placed in front of the pituatory fossa - 10%Postfixed chiasma - placed posteriorly above the pituatory fossa-10%.