单选题：According to the passage, which of the following is TRUE?

题目内容：
According to the passage, which of the following is TRUE? A．All Americans are persuaded not to get vaccinated this year.
B．The big problem in innovating flu vaccine producing technique is how to grow virus in a new way.
C．More flu vaccines can not be produced in a short time because private companies refuse to produce more.
D．Flu vaccines are easier than most vaccines to produce through cell cultures.
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答案解析：

Private companies have little interest in producing flu vacc

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