This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveal tract, Subject name: Ophthalmology
In acute anterior uveitis, pupil is - 
Select and explain. 
A. Oval, B. Circular, C. Small, irregular, D. Any of the above
C: Small, irregular
Answer: C: Small, irregular 
Explanation: Pupillary signs 1. Narrow pupil: It occurs in acute attack of iridocyclitis due to irritation of sphincter pupillae by toxins. Iris oedema and engorged radial vessels of iris also contribute in making the pupil narrow. 2. Irregular pupil shape: It results from segmental posterior synechiae formation. Dilatation of pupil with atropine at this stage results in festooned pupil.