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
A farmer presented with 'New castle conjunctivitis'. It is caused by contact with diseased: 
Select and explain. 
A. Dogs, B. Cats, C. Owls, D. Horses
C: Owls
Answer: C: Owls 
Explanation: Newcastle conjunctivitis is a rare type of acute follicular conjunctivitis caused by Newcastle virus. The infection is derived from contact with diseased owls; and thus the condition mainly affects poultry workers. Clinically the condition is similar to pharyngoconjunctival fever. Ref: Comprehensive Ophthalmology by A K Khurana, 4th edition, Page 70.