Question

the first vaccination was developed by ______. using a culture of cowpox to prevent smallpox using a culture of typhus to cure scurvy using sheeps blood to prevent illness using an elixir of fruit juice to prevent typhus

Explanation:

The first vaccination (for smallpox) was developed by Edward Jenner using cowpox culture to prevent smallpox. The second option is incorrect as typhus doesn't cure scurvy (scurvy is due to vitamin C deficiency, and typhus is a different disease). The third option (sheep’s blood) is not related to the first vaccination. The fourth option (fruit juice elixir for typhus) is also incorrect. So the correct option is the first one.

Answer:

A. using a culture of cowpox to prevent smallpox