## **Core Concept**
Lochia refers to the vaginal discharge that occurs after childbirth, comprising blood, bacteria, and tissue debris from the uterus. It is a natural process that signifies the healing and cleansing of the uterine cavity postpartum. The duration of lochia can vary but generally follows a predictable pattern.

## **Why the Correct Answer is Right**
The correct answer indicates that lochia lasts for about 3 weeks. Typically, lochia is divided into three stages: lochia rubra (first 2-3 days, predominantly blood), lochia serosa (or lochia sanguinolenta, 3-7 days, more watery and pinkish), and lochia alba (or lochia purulenta, up to 3 weeks postpartum, whitish or creamy). This progression signifies the healing process of the endometrium. The total duration usually ranges from 2 to 4 weeks but averages around 3 weeks.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option suggests a duration that is too short for the complete resolution of lochia.
- **Option B:** This option might suggest a slightly longer duration but is still not the average duration for the complete cessation of lochia.
- **Option D:** This option suggests a duration that is longer than what is typically expected for lochia.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while lochia can last up to 3-4 weeks, it is concerning if it persists beyond 4-6 weeks or is heavy, accompanied by clots, or associated with foul odor, fever, or other signs of infection.

## **Correct Answer:** C. 3 weeks.