**Core Concept**
Nova-T is a type of intrauterine device (IUD) used for contraception. It is a non-hormonal, copper-releasing IUD that works by creating a local inflammatory response in the uterus, which is toxic to sperm and prevents fertilization.

**Why the Correct Answer is Right**
The correct answer is a list of the components of Nova-T. The IUD is made of a plastic frame wrapped in a copper wire. The copper wire is the key component that releases ions, which create a toxic environment for sperm. The copper ions also stimulate the local inflammatory response in the uterus, further preventing fertilization. The plastic frame provides structural support to the device and allows it to be inserted into the uterus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not mention copper, which is the primary component of Nova-T that provides its contraceptive effect.
**Option B:** This option is incorrect because it is a general term that could refer to any type of IUD, not specifically Nova-T.
**Option C:** This option is incorrect because it mentions estrogen, which is not a component of Nova-T. Nova-T is a non-hormonal IUD.

**Clinical Pearl / High-Yield Fact**
It's essential to note that copper IUDs like Nova-T are effective for up to 10 years and have a low failure rate. They are also reversible, meaning that fertility returns quickly after removal.

**Correct Answer: D. Copper and plastic**