If the menstrual cycle of a female is 28 days , what will be the time period of periodic abstinence (avoiding sex) as natural method of contraception ?

Options

A. 13th to 20th day of menstrual cycle
B. 5th to 12th day of menstrual cycle
C. 17th to 24th day of menstrual cycle
D. 10th to 17th day of menstrual cycle

Answer

To solve the question regarding the time period of periodic abstinence as a natural method of contraception during a 28-day menstrual cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Menstrual Cycle**: The menstrual cycle typically lasts about 28 days, although it can vary among individuals. It consists of several phases, including the follicular phase, ovulation, and the luteal phase.

2. **Identify the Ovulation Period**: Ovulation usually occurs around the midpoint of the menstrual cycle. For a 28-day cycle, ovulation typically occurs around day 14. This is when the ovum is released and is the most fertile time for a woman.

3. **Determine the Fertile Window**: The fertile window is generally considered to be a few days before and after ovulation. Sperm can survive in the female reproductive tract for up to 5 days, and the ovum is viable for about 24 hours after ovulation. Therefore, the fertile period usually spans from about day 10 to day 17 of the cycle.

4. **Apply Periodic Abstinence**: To avoid pregnancy, couples practicing periodic abstinence should refrain from sexual intercourse during the fertile window. This means they should avoid intercourse from day 10 to day 17 of the menstrual cycle.

5. **Conclusion**: The correct time period for periodic abstinence to avoid pregnancy in a 28-day menstrual cycle is from day 10 to day 17.

### Final Answer:
The time period of periodic abstinence as a natural method of contraception is from **day 10 to day 17** of the menstrual cycle.