<prompt> Not a barrier contraceptive:DiaphragmCentchromanCondomToday  <response>: Ans. is b, i.e. CentchromanRef: 15thed, p222Barrier Methods include: Condoms for male use Diaphragms for female use - Types1. Femshield female condom2. Today contraceptivevaginal sponge3. Vaginal diaphragmcervical capBesides these spermicidal agents like nonoxynol 9, octoxynol, and menfegol can be added to any of the above barrier contraceptive, to increase its effectiveness. 