单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Which of the following is NOT mentioned in the news

A．XMRV was found in tumor samples.
B．XMRV can be found in healthy blood.
C．The causes of XMRV haven’t been determined.
D．A lot of people were infected by XMRV.
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