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: Social & Preventive Medicine
Confirmatory diagnostic test used in HIV 
Select and explain. 
A. ELISA, B. SIMPLE test, C. Western Blot Assay, D. RAPID test
C: Western Blot Assay
Answer: C: Western Blot Assay 
Explanation: None