**Core Concept**
The underlying principle being tested is the association between different types of hepatitis and the risk of hepatic encephalopathy in pregnancy. Hepatic encephalopathy is a brain condition that is caused by liver disease, and in pregnancy, the risk varies with the type of hepatitis.

**Why the Correct Answer is Right**
Hepatitis E is known to have a more severe course in pregnant women, especially in the third trimester, with a higher risk of developing hepatic encephalopathy. This is due to the fulminant nature of Hepatitis E infection in pregnancy, which can lead to rapid deterioration of liver function.

**Why Each Wrong Option is Incorrect**
**Option A:** Hepatitis A is generally a self-limiting illness and does not typically lead to hepatic encephalopathy.
**Option B:** Hepatitis B can cause chronic liver disease but the risk of hepatic encephalopathy in pregnancy is not as high as with Hepatitis E.
**Option C:** Hepatitis C also leads to chronic liver disease but is less likely to cause acute liver failure and hepatic encephalopathy in pregnancy compared to Hepatitis E.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that Hepatitis E has a high mortality rate in pregnant women, especially in developing countries, and prompt recognition and management are key to reducing this risk.

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