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: Pharmacology
Chloroquine is useful in : 
Select and explain. 
A. Discoid lupus erythematosis, B. Rheumatoid arthritis, C. Infectious mononucleosis, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None