Investigations into the Causes of Attention-Deficit Hyperactivity Disorder Have Revealed

Multiple Choice

Investigations into the causes of attention-deficit hyperactivity disorder have revealed

A) a strong association with a high-sugar diet.
B) evidence that cigarette smoking and drinking while pregnant increases the risk of ADHD in offspring.
C) no evidence of gene-environment interaction.
D) no link to low birth weight or prematurity.