**Core Concept**
A newly married healthy couple requires a contraceptive method that is highly effective, easy to use, and has minimal side effects. The ideal contraceptive should prevent pregnancy while allowing for spontaneity and convenience in their sexual relationship.

**Why the Correct Answer is Right**
The best contraceptive for a newly married couple is the Oral Contraceptive Pill (OCP). OCPs contain a combination of estrogen and progestin hormones that suppress ovulation, making it difficult for the couple to conceive. The hormones also thicken cervical mucus, making it harder for sperm to reach the egg. Additionally, OCPs can regulate menstrual cycles, reduce menstrual cramps, and improve overall reproductive health.

**Why Each Wrong Option is Incorrect**
**Option A:** Barrier methods like condoms are not the best choice for a newly married couple as they can reduce spontaneity and have a higher failure rate compared to hormonal contraceptives.
**Option B:** Natural family planning methods rely on tracking ovulation and can be less effective, requiring more effort and dedication from the couple.
**Option C:** Intrauterine devices (IUDs) are more suitable for couples who have completed childbearing or have specific medical indications, as they require a medical procedure for insertion and can cause side effects.

**Clinical Pearl / High-Yield Fact**
When prescribing OCPs, it's essential to assess the couple's medical history, particularly for conditions like hypertension, thromboembolic disorders, and liver disease, which may contraindicate their use.

**Correct Answer: D. Oral Contraceptive Pill (OCP)**