Following vasectomy,: (A) Sterility is achieved immediately, (B) Onset of sterility is predictable, (C) Semen has to be analyzed till 2 consecutive sperm counts are zero, (D) No need to use additional contraception after 1 month
Answer is C. Sterility following vasectomy is not immediate nor is its onset predictable. Thus another form of contraception is recommended until azoospermia is documented.