A Gene Variant That,when Homozygous,may Be Common to People with Addictions

Multiple Choice

A gene variant that,when homozygous,may be common to people with addictions to different substances is

A) the CFTR allele that also causes cystic fibrosis.
B) the serotonin transporter A5.
C) the A1 allele of the dopamine D(2) receptor.
D) the dopamine transporter B3.
E) the LSD reuptake inhibitor C5.