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
A 60-year-old male presents with coloured halos. On Fincham&;s test, the halos split and then reunite. The most probable diagnosis is 
Select and explain. 
A. Acute congestive glaucoma, B. Open angle glaucoma, C. Senile immature cataract, D. Mucopurulent conjunctivitis
C: Senile immature cataract
Answer: C: Senile immature cataract 
Explanation: The coloured halos in glaucoma must be differentiated from those found in acute purulent conjunctivitis and early cataractous changes. In conjunctivits, the halos can be eliminated by irrigating the discharge. 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:- A K KHURANA; pg num:-228