Not a barrier contraceptive:
Ans. is b, i.e. CentchromanRef: 15th/ed, p222Barrier Methods include:* Condoms (for male use)* Diaphragms (for female use) - Types1. Femshield (female condom)2. Today contraceptive/vaginal sponge3. Vaginal diaphragm/cervical capBesides these spermicidal agents like nonoxynol 9, octoxynol, and menfegol can be added to any of the above barrier contraceptive, to increase its effectiveness.
Contraceptives
Diaphragm
Centchroman
Condom
Today
Centchroman