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
[{'content': 'Bitemporal hemianopic field defect is charactersitic of: \nSelect and explain. \nA. Glaucoma, B. Optic neuritis, C. Pituitary tumour, D. Retinal detachment', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Pituitary tumour', 'role': 'assistant'}]