What led scientists to begin asking if there was a causal relationship between vaccines and autism?
A. Autism is first diagnosed around the same time that children receive immunizations.
B. Other countries have found a causal relationship between immunizations and autism.
C. Immunizations contain neurotoxins, but it has always been believed they were safe.
D. As the use of immunizations increased, there was an increase in diagnoses of autism.
Answer:A
What led scientists to begin asking if there was a causal relationship between vaccines and autism?
A. Autism is first diagnosed around the same time that children receive immunizations. B. Other countries have found a causal relationship between immunizations and autism. C. Immunizations contain neurotoxins, but it has always been believed they were safe. D. As the use of immunizations increased, there was an increase in diagnoses of autism.