## **Core Concept**
The feco-oral route of transmission refers to the spread of pathogens through the ingestion of food or water contaminated with fecal matter. This route is commonly implicated in the transmission of various infectious diseases, particularly those caused by viruses, bacteria, and protozoa.

## **Why the Correct Answer is Right**
Hepatitis A and E are primarily transmitted through the feco-oral route. This route involves the ingestion of food or water contaminated with the feces of an infected individual. Poliomyelitis is also transmitted through this route, where the virus multiplies in the intestine.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Hepatitis A is transmitted through the feco-oral route, making it an incorrect choice for "all except."
- **Option B:** Poliomyelitis is also spread through the feco-oral route, which is why it's not the correct answer to the question.
- **Option C:** Hepatitis E, similar to A and poliomyelitis, is transmitted via the feco-oral route, making it incorrect for "all except."

## **Why Option D is Correct**
- **Option D:** Hepatitis B is primarily transmitted through parenteral routes (such as blood and bodily fluids) and not through the feco-oral route. This makes Hepatitis B the correct answer to the question as it does not use the feco-oral route of transmission.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while Hepatitis A and E are mainly spread through the feco-oral route, Hepatitis B and C are primarily spread through parenteral exposure to infected blood or bodily fluids. This distinction is crucial for understanding the epidemiology and for implementing appropriate preventive measures for each type of hepatitis.

## **Correct Answer: D. Hepatitis B.**