Which statement about immunizations and autism is true?
A. Because concerns about a link between immunizations and autism are relatively new, no studies of the issue have been completed.
B. Research has confirmed a moderate causal link between common immunizations and a rise in the number of children diagnosed with autism.
C. Numerous large-scale studies show no association between the measles-mumps-rubella vaccine and the incidence of autism.
D. In areas where many parents refuse to immunize their children, disease outbreaks are no more common than in other areas.
Answer: C
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