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: Microbiology
Diagnosis of Dengue fever can be made earliest by? 
Select and explain. 
A. Viral culture, B. NS - 1 antigen detection, C. lgG antibody detection, D. Nucleic acid test
B: NS - 1 antigen detection
Answer: B: NS - 1 antigen detection 
Explanation: Ans. is 'b' i.e., NS-1 antigen detection