**Core Concept:** Hepatitis refers to inflammation of the liver, caused by various pathogens like viruses, bacteria, and autoimmune diseases. During pregnancy, the liver undergoes physiological changes, making it more susceptible to certain hepatitis strains. Hepatitis E virus (HEV) is a common cause of acute viral hepatitis globally.

**Why the Correct Answer is Right:** Hepatitis E is associated with higher morbidity during pregnancy due to the following reasons:
1. **Hepatitis E virus (HEV) is transmitted via the fecal-oral route, primarily through contaminated water or food.** During pregnancy, the immune system is weakened, making pregnant women more susceptible to viral infections.
2. **HEV primarily affects the liver, causing acute hepatitis.** In pregnant women, the virus can cross the placenta, leading to vertical transmission and causing severe acute hepatitis in the fetus or newborn.

**Why Each Wrong Option is Incorrect:**
1. **Option A (Hepatitis A):** Hepatitis A can also cause acute hepatitis in pregnant women. However, HEV is more common in endemic areas and has a higher morbidity rate.
2. **Option B (Hepatitis B):** Hepatitis B is not typically associated with higher morbidity during pregnancy. While pregnant women can contract the virus, the disease course is usually milder.
3. **Option C (Hepatitis D):** Hepatitis D is a superinfection of Hepatitis B and does not have a higher morbidity rate during pregnancy compared to Hepatitis B alone.

**Clinical Pearl:** Hepatitis E is an essential topic for medical students and doctors, especially in endemic areas. Prevention measures include access to clean water, sanitation, and vaccination against HEV, especially in high-risk populations. If infected, timely diagnosis and supportive care can prevent severe complications in both pregnant women and their fetuses/newborns.