Question

the mystery began the day farmer russ kremers knee was slashed by a boar with a razor - sharp tusk. the missouri pig farmer shrugged off the wound and went back to work. later, his leg became inflamed and ballooned to twice its size. he had contracted an infection that threatened his life - and baffled doctors who wondered why two months of treatment with multiple antibiotics had done little to ease the condition. the answer was flowing in the veins of the boar: kremer had fed the animal slop laced with low doses of an antibiotic, spawning a germ that was resistant to drugs. that drug - resistant germ had passed to kremer.
more and more americans - many of them living far from barns and pastures - are at risk from the widespread practice of feeding antibiotics to pigs and other livestock such as cows and chickens. now, a flurry of new research associates antibiotic use in animals with drug resistance in people. some lawmakers are proposing new laws aimed at banning farmers from administering the drugs to healthy livestock. many people in the agricultural and pharmaceutical industries, however, are devoting large sums of money to defeating the bills.
question 3
what is this article mainly about?
a. officials halted a decision to stop the use of antibiotics after receiving hundreds of letters.
b. a farmer in missouri contracted a drug - resistant infection during a scuffle with a boar.
c. some foreign countries have instituted bans on meat imported from the united states.
d. the overuse of antibiotics on livestock has been linked to drug resistance in humans.

Explanation:

The article starts with a farmer's story of getting a drug - resistant infection. Then it expands to talk about the overuse of antibiotics on livestock and its link to drug resistance in humans. Option A only mentions officials halting a decision, which is not the main focus. Option B is just a part of the story (the farmer's case). Option C about foreign bans on US meat is not the main topic. Option D encompasses the overall theme of the overuse of antibiotics on livestock and its consequence (drug resistance in humans).

Answer:

D. The overuse of antibiotics on livestock has been linked to drug resistance in humans.