Vaccine for hepatits B is produced from transgenic cow/ yeast.

Explanation

**Step-by-Step Solution:**

1. **Understanding Hepatitis B**: Hepatitis B is a viral infectious disease that primarily affects the liver. It is caused by the Hepatitis B virus (HBV).

2. **Vaccine Production**: Vaccines are typically produced using components of the virus. In the case of Hepatitis B, the vaccine is made using the surface proteins of the virus.

3. **Surface Protein Extraction**: The first step in vaccine production involves extracting the surface protein from the Hepatitis B virus. This protein is crucial as it helps the immune system recognize and fight the virus.

...