**Core Concept**
The question is testing the knowledge of the association between viral hepatitis infections and maternal mortality during pregnancy. Viral hepatitis infections can have varying degrees of severity and impact on pregnant women, particularly during the third trimester. Hepatitis E is a significant concern in pregnant women due to its high mortality rate.

**Why the Correct Answer is Right**
Hepatitis E infection is particularly severe in pregnant women, especially during the third trimester. This is because the virus triggers a more aggressive immune response, leading to severe liver inflammation and failure. The mortality rate for Hepatitis E infection in pregnant women is significantly higher compared to other forms of viral hepatitis. The exact mechanism is not fully understood, but it is believed that the virus triggers a cytokine storm, leading to severe inflammation and liver damage.

**Why Each Wrong Option is Incorrect**
**Option A:** Hepatitis A is generally a self-limiting infection with a low mortality rate, especially in pregnant women. It is primarily spread through the fecal-oral route and does not have a significant impact on maternal mortality.

**Option B:** Hepatitis B can be transmitted from mother to child during birth, but the mortality rate is not as high as Hepatitis E. Hepatitis B infection can also lead to chronic liver disease, but it is not as severe in pregnant women as Hepatitis E.

**Option C:** Hepatitis C is a chronic infection that can lead to liver cirrhosis and cancer, but it is not typically associated with high maternal mortality in pregnancy. Hepatitis C is primarily spread through blood-to-blood contact, and its impact on pregnant women is generally lower than Hepatitis E.

**Clinical Pearl / High-Yield Fact**
Hepatitis E infection in pregnancy is a significant concern, particularly in areas with poor sanitation and hygiene. Pregnant women from these regions should be screened for Hepatitis E virus (HEV) infection, especially during the third trimester. Early diagnosis and management can significantly improve outcomes.

**Correct Answer Line**
✓ Correct Answer: D. Hepatitis E