Question: Some antibiotics used to treat infections in humans are also used to treat chickens, but some groups oppose this practice. The overuse of the antibiotics will most likely influence the natural selection of which type of organisms?

  Options: 
 A. chickens that naturally make the antibiotics
 B. microbes that are resistant to the antibiotics
 C. microbes that are susceptible to the antibiotics
 D. chickens that are resistant to infection
Answer: B