In basal body temperature method, after the rise of temperature, the unsafe period lasts for :-: (A) 24 hours, (B) 48 hours, (C) 72 hours, (D) 120 hours
Answer is C. - In BBT, the rise of temperature signifies ovulation. - Since maximum survival of ovum post ovulation is 3 days, the unsafe period is 3 days post rise of body temperature. Other natural methods of contraception are: Calender method / feile period method/ safe period method/ rhythm method Cervical mucus method Symptothermic method Coitus interruptus Abstinence - most effective method