## **Core Concept**
The CuT 380A is a type of Intrauterine Contraceptive Device (IUCD) that releases copper ions to prevent pregnancy. It is a popular long-acting reversible contraceptive method. The duration of its effectiveness is crucial for its clinical application.

## **Why the Correct Answer is Right**
The CuT 380A IUCD is designed to release 380 micrograms of copper per day. Its efficacy and duration of action are well-established, making it a reliable option for long-term contraception. The CuT 380A is approved for use for up to 10 years, making option B the correct answer.

## **Why Each Wrong Option is Incorrect**
* **Option A:** 5 years is too short for the CuT 380A, which has a proven longer duration of action.
* **Option C:** 15 years exceeds the approved duration for the CuT 380A, which is specifically recommended for 10 years.
* **Option D:** 20 years is far beyond the recommended and tested duration for the effectiveness and safety of CuT 380A.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while the CuT 380A is approved for 10 years, some studies and clinical experiences suggest potential extended use up to 12 years, but this should be under medical supervision. Always check the latest guidelines and product inserts for the most current recommendations.

## **Correct Answer:** B. 10 years.