<prompt> Vaccine with maximum efficacyOPVMeaslesBCGTT  <response>: b. MeaslesRef: Nelsons 20e p 1546, Ghai 8e p 145; IAP guidebook of Immunization 2013-14, p 222-223Seroconversion rates after measles vaccination are around 60 at the age of 6 months, 80-85 at the age of 9 months and beyond 95 at the age of 12-15 months. 