**Core Concept**
Gestational diabetes mellitus (GDM) is a condition characterized by **high blood sugar levels** discovered during pregnancy in otherwise healthy, non-diabetic women. It is associated with various maternal and fetal complications. The diagnosis of GDM is based on the results of a **glucose challenge test (GCT)** followed by a **glucose tolerance test (GTT)** if the GCT is abnormal.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general complications of GDM. GDM can lead to **macrosomia** (excessive birth weight), **polyhydramnios** (excess amniotic fluid), and **preterm labor**. It also increases the risk of **cesarean delivery**, **hypertension**, and **preeclampsia**. Fetal complications include **respiratory distress syndrome**, **hypoglycemia**, and **jaundice**.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, we cannot determine why it is incorrect.
**Option B:** Similarly, without the option, its incorrectness cannot be explained.
**Option C:** This option's incorrectness is also unknown without the specific text.
**Option D:** The same applies to this option.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that women with a history of GDM are at increased risk of developing **type 2 diabetes** later in life. Thus, postpartum follow-up and screening for diabetes are crucial.

**Correct Answer:**