The incidence of major depressive disorder is greatest among those

A) raised together with a nontwin sibling who suffers the disorder.
B) raised apart from a fraternal twin who suffers the disorder.
C) raised together with a fraternal twin who suffers the disorder.
D) raised apart from an identical twin who suffers the disorder.

Major Depressive Disorder

A mental health condition characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in daily activities for at least two weeks.

Fraternal Twin

Siblings born at the same time as a result of two different eggs being fertilized by two different sperm, sharing about 50% of their DNA, similar to non-twin siblings.