Which of the following is NOT considered a risk factor for autism spectrum disorder (ASD)?

• A. Advanced parental age at conception
• B. Regular physical exercise during pregnancy
• C. Prenatal exposure to certain toxins
• D. Having a sibling with ASD

Answer: (B)

Verified step by step guidance

1. Step 1: Understand what a risk factor is in the context of autism spectrum disorder (ASD). A risk factor is any attribute, characteristic, or exposure that increases the likelihood of developing ASD.
2. Step 2: Review each option and consider whether it has been scientifically linked to an increased risk of ASD. For example, advanced parental age at conception has been associated with a higher risk of ASD in offspring.
3. Step 3: Recognize that prenatal exposure to certain toxins (such as some chemicals or medications) has also been identified as a potential risk factor for ASD.
4. Step 4: Note that having a sibling with ASD is a strong genetic risk factor, as ASD tends to run in families due to genetic influences.
5. Step 5: Identify that regular physical exercise during pregnancy is generally considered beneficial for both mother and child and is not linked to an increased risk of ASD, making it the option that is NOT a risk factor.