**Core Concept**
Human menopausal gonadotropin (hMG) is a medication used in assisted reproductive technology (ART) to stimulate ovulation and increase the chances of pregnancy. It contains both follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which help in the development and maturation of follicles in the ovaries.

**Why the Correct Answer is Right**
The use of hMG can lead to multiple pregnancy due to the stimulation of multiple follicles in the ovaries, resulting in the release of multiple eggs during ovulation. This increases the chances of multiple gestations, including twins, triplets, or even higher-order multiples. The FSH and LH in hMG promote follicular growth, leading to the potential for multiple pregnancies.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because hMG is not typically associated with an increased risk of ectopic pregnancy.

**Option B:** Incorrect because hMG is not commonly linked to an increased risk of miscarriage.

**Option C:** Incorrect because hMG is not typically associated with an increased risk of stillbirth.

**Clinical Pearl / High-Yield Fact**
It is essential for healthcare providers to discuss the risks of multiple pregnancy with patients undergoing ART, including the increased risks of preterm labor, low birth weight, and pregnancy complications.

**Correct Answer: D. Multiple pregnancy.**