<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Can you tell me why vaccines cause autism?
<|assistant|>
There is no proven link between vaccines and autism. However, some parents and experts have claimed that vaccines may cause autism due to an immune system overstimulation or a lack of proper biological support due to certain medical conditions. Other theories include a combination of vaccine components, including aluminum, and the development of a disorder caused by environmental and genetic factors.