请教陈书P89第18题

Cathelin

陈书P89第18题题目如下：
Since the routine of antibiotics can give rise to resistant bacteria capable of surviving antibiotic enviroments,the presence of resistant bacteria in people could be due to the human use of prescription antibiotics.Some scientists,however,believe that most resisitant bacterial in people derive from human consumption of bacterially infected meat.
Which of the following statement,if true,would most significantly strengthen the hypothesis of the scientists?
A) Antibiotics are routinely included in livestock feed so that livestock producers can increase the rate of growth if their animals.
答案是A可我不明白请详细解释，谢谢了！

dansy

这题说经常服用抗生素可以导致细菌的抗药性，而这些抗药性是因为人们经常服用药方上的抗生素。但是有些科学家认为在人类身上大部分有抗药性的细菌是来自于人们经常食用细菌感染的肉类。题目问什么能加强这个假设。A说家畜生产者经常用含有抗生素的饲料来喂养家畜，因为这样可以提高生长率。就是说人们经常食用含有抗生素的肉类，这样间接食用了抗生素，而这样就导致了有抗药性的细菌。