## **Core Concept**
Acute fatty liver of pregnancy (AFLP) is a rare but serious condition that occurs during pregnancy, characterized by liver dysfunction and fatty infiltration of liver cells. It is often associated with significant maternal and fetal morbidity and mortality if not promptly recognized and managed. AFLP typically presents in the third trimester.

## **Why the Correct Answer is Right**
The correct answer, third trimester, is right because AFLP usually manifests between 34 and 36 weeks of gestation. This timing is critical for diagnosis and management to prevent severe complications. The condition is thought to result from a combination of genetic predisposition, hormonal influences, and environmental factors that affect mitochondrial function in the liver.

## **Why Each Wrong Option is Incorrect**
- **Option A:** First trimester - This is incorrect because AFLP is not typically seen in the first trimester. Conditions like hyperemesis gravidarum are more common during this period.
- **Option B:** Second trimester - This is incorrect because AFLP is rare in the second trimester. Most cases are identified later in pregnancy.
- **Option D:** Postpartum period - This is incorrect because while AFLP can occasionally present postpartum, it is most commonly identified during the third trimester.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that AFLP often presents with nonspecific symptoms such as nausea, vomiting, and abdominal pain, which can be mistaken for more common pregnancy-related conditions. A high index of suspicion and prompt laboratory evaluation, including liver function tests and coagulation studies, are crucial for early diagnosis. The Swansea criteria, a set of clinical and laboratory features, can aid in the diagnosis.

## **Correct Answer:** C. Third trimester.