单选题 It can be inferred from the passage that tainted blood products are ______.

A、 beat-treated blood products used in the mid-1980s
B、 heat-treated blood products imported from U.S. drug giant Baxter International Inc
C、 untreated blood products which caused infection among hemophiliacs in Japan
D、 untreated blood products produced by Baxter and some other foreign companies

【正确答案】 C

【答案解析】根据文章可知，被感染的血液是未经处理的，所以A，B皆不正确；而文中提到，日本本国的公司也生产未经热处理的血液，所以被感染的血液并不一定是由外国公司生产的，D项也不正确。