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
A lesion of the optic radiation involving the Meyer's loop causes - 
Select and explain. 
A. Homonymus hemianiopia, B. Superior quadrantanopia, C. Inferior quadrantanopia, D. Central scotoma.
B: Superior quadrantanopia
Answer: B: Superior quadrantanopia 
Explanation: Meyer's loops are the inferior most fibres of optic radiation. Damage to inferior fibres cause superior quadrantanopia.