Linda suffers from depression, whereas her brother Kyle is more emotionally stable. Which of the following genes is likely to differ between Kyle and Linda?

A) DRD4
B) SSRI
C) 5-HTT
D) APOA

Depression

A psychological condition manifested by a continuous low mood or lack of enthusiasm for activities, significantly disrupting everyday life.

Emotionally Stable

A personality trait indicative of a person's ability to remain calm and composed under stress or in the face of adversity.

5-HTT

A gene that encodes for the serotonin transporter, which is responsible for the reuptake of serotonin from the synaptic cleft back into the presynaptic neuron.