**Core Concept**
Diabetes mellitus in pregnancy is a complex condition with various complications, including increased risk of fetal and maternal morbidity. The physiological changes during pregnancy can exacerbate the underlying metabolic disturbances in diabetes, leading to a range of clinical features.

**Why the Correct Answer is Right**
The correct answer is not a feature of diabetes mellitus in pregnancy. One of the key features of gestational diabetes mellitus (GDM) is the increased insulin resistance, which is a result of the placental hormones such as human placental lactogen (hPL) and estrogen. These hormones antagonize the action of insulin, leading to hyperglycemia. The insulin resistance is more pronounced in the second and third trimesters of pregnancy. In contrast, **Option A** is a feature of diabetes mellitus in pregnancy.

**Why Each Wrong Option is Incorrect**
**Option A:** Hypoglycemia is not a feature of diabetes mellitus in pregnancy. In fact, the opposite is true, and diabetes mellitus in pregnancy is associated with hyperglycemia due to increased insulin resistance and impaired insulin secretion.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize that the physiological changes during pregnancy can mask the symptoms of diabetes mellitus, making it crucial to screen for GDM in pregnant women.

**Correct Answer:** A. Hypoglycemia