648. Babu, a 28 year old male comes with compaint of exposure 3 wks back, having cervical Lymphadenopathy, Hepatosplenomegaly. Diagnosis of HIV is done by____________? September 27, 2025 by Admin A. ELISA B. Western blot C. P24 antigen D. Lymph node biopsy ✅ The correct answer is option P24 antigen.