## Core Concept
Norplant is a type of **subdermal contraceptive implant** that releases **levonorgestrel**, a synthetic progestin, to prevent pregnancy. It is a long-acting reversible contraceptive method.

## Why the Correct Answer is Right
The correct answer, , states that Norplant is effective for **5 years**. Norplant works by releasing a steady dose of levonorgestrel into the bloodstream, which prevents ovulation and thickens cervical mucus to block sperm. Its efficacy lasts for 5 years, after which the implants need to be removed and can be replaced if continued contraception is desired.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because Norplant does not require daily attention like oral contraceptives; it is a set-it-and-forget-it method for 5 years.
* **Option B:** This option is incorrect as it inaccurately describes the duration or mechanism of action of Norplant.
* **Option C:** This option might seem plausible but is incorrect because the standout feature of Norplant is its long-acting nature, not a daily regimen.
* **Option D:** This option is incorrect because it does not accurately represent a characteristic unique or specifically true for Norplant.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while Norplant is highly effective, its use can be associated with changes in menstrual bleeding patterns, including **irregular periods**, **amenorrhea**, or **heavy bleeding**. Understanding these potential side effects is crucial for counseling patients.

**Correct Answer: C. Effective for 5 years.**