This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Patient developed acute redness of eye with mucopurulent discharge and halos. It did not stain with fluorescein. The halos subsided after washing with clean water and the patient responded to five day course of topical antibiotics. What should be your probable diagnosis? 
Select and explain. 
A. Angle closure glaucoma, B. Uveitis, C. Acute bacterial conjunctivitis, D. Immature senile cataract
C: Acute bacterial conjunctivitis
Answer: C: Acute bacterial conjunctivitis 
Explanation: Acute bacterial conjunctivitis Approach to Question Halos of conjunctivitis are due to prismatic effect of mucus and are removed by washing unlike that of angle closure glaucoma and immature senile cataract and uveitis. Other Points in or are: Acute onset. No corneal staining.(flourscein staining is seen in case of viral kerataitis) Mucopurulent discharge.