**Core Concept:** Norplant is a long-acting contraceptive method that delivers levonorgestrel, a progestin hormone, to suppress ovulation and thicken cervical mucus to prevent sperm entry into the uterus.

**Why the Correct Answer is Right:** Norplant contains seven cylindrical capsules, each filled with levonorgestrel. The capsules are made of biocompatible material and are designed to slowly release the hormone over an extended period, typically 5-7 years. The hormone concentration in the bloodstream is maintained at a relatively constant level, providing efficient contraception.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because Norplant contains seven capsules, not six.
B. Similar to option A, this choice is incorrect due to the incorrect number of capsules.
C. While Norplant does release levonorgestrel, the incorrect answer choice suggests a different contraceptive method (intrauterine device) that uses copper to prevent fertilization.
D. This option is incorrect because Norplant consists of seven levonorgestrel-filled capsules, not eight.

**Clinical Pearl:**

Norplant is a long-acting contraceptive method that offers significant advantages over short-acting methods, such as patient convenience, reduced pill burden, and reduced risk of side effects. However, it is crucial to counsel patients about the potential side effects like weight gain, breast tenderness, and changes in mood.

**Correct Answer:** D. Norplant contains eight levonorgestrel-filled capsules.