Question

Finish the sentence with the word resistance. To avoid getting sick

Answer 1

There are many ways you can use this word, but ultimately, you need to develop a resistance to the germs in order avoid getting sick.  The answer you have been given does not use the word correctly (although A for the effort).  I would write it as, "To avoid getting sick, one must develop a resistance to the germs or virus that is causing the illness."

Answer 2

Stay away from people who are sick with resistance