单选题 According to the author, one will become obsessive-compulsive ______.

A、 if he washes his hands every time he touches a surface
B、 if he only washes his hands with soap and water
C、 if he could not win over the bacteria in his home
D、 if he does not fight against the bacteria at home

【正确答案】 A

【答案解析】[解析] 根据最后一段内容可知，A项为正确答案。