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: Unknown
Test available for AIDS virus detection includes - 
Select and explain. 
A. Karpas test, B. Western blot test, C. ELISA test, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans: D