Which of the following is true about the connection between the MMR vaccine and autism?
a. There is no scientific evidence that the MMR vaccine causes autism.
b. The connection between MMR and autism remains unclear.
c. There is strong scientific evidence that the MMR vaccine causes autism.
d. The MMR vaccine causes autism if administered more than once.
Answer: A
Rationale: The hypothesis that the MMR vaccine causes autism unraveled when other groups of scientists could not replicate the original findings that called this relationship into question.
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