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: Medicine
The following are true about measles- 
Select and explain. 
A. It is an RNA virus, B. Causes Koplik's spots on the conjunctiva, C. Acute catarrhal conjunctivitis is a known features, D. All the above
D: All the above
Answer: D: All the above 
Explanation: None