<prompt> Most effective way to prevent HIV veical transmission isHAANevirapineZidovudineElective cesarean  <response>: Women enrolled on HAA Triple ARV prophylaxis had a much lower 1 rate of HIV veical transmission as compared to Zidovudine lone HAA showed similar rates of Transmission when Zidovudine monotherapy was combined with single dose of Maternal or neonatal Nevirapine Ref: Perinatal and pediatric HIVAIDS by Mamatha 1st edition Pgno : 344 