单选题 Among the farmers investigated, how many of them claimed to be suffering from organophosphate poisoning?______

【正确答案】 C
【答案解析】第二段第三、四、五句指出,有400名农民接受问卷调查,有179人作了回答,130人称曾暴露于有机磷农药,21人抱怨说已经被诊断为有机磷农药中毒症状。