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
Headache with bitemporal hemianopia with 6/6 vision seen with: 
Select and explain. 
A. Optic neuritis, B. Trauma, C. Chiasmal lesions, D. B/L cavernous lesions
C: Chiasmal lesions
Answer: C: Chiasmal lesions 
Explanation: Chiasmal lesions