This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': "Fincham's test differentiates cataract from - \nSelect and explain. \nA. Conjunctivitis, B. Iridocyclitis, C. Open angle Glaucoma, D. Ac. Congestive Glaucoma", 'role': 'user'}, {'content': "Answer: D \nExplanation: The halos of glaucoma and immature cataract may be differentiated by Fincham's test in which a stenopaeic slit is passed across the pupil . During this test , glaucomatous halo remains intact, while a halo due to cataract is broken up into segments . Ref: Comprehensive Ophthalmology AK Khurana 6th edition chapter-10 page no: 244", 'role': 'assistant'}]