Dr. Allan, a psychologist, believes that women are more prone to depression because they experience fluctuations in estrogen levels, whereas men do not. Dr. Allan seems to favor a approach to understanding depression.

biological

Explanation:

Dr. Allan, a psychologist, believes that women are more prone to depression because they experience fluctuations in estrogen levels, whereas men do not. Dr. Allan seems to favor a biological approach to understanding depression.  The biological approach to depression is concerned with the role of neurotransmitters and hormones and their imbalances relating to the feeling of depression. For example seratonin is responsible for regulating sleep, eating and sexual behavior, and mood. Thus any imbalance in seratonin can lead to depression.

a: social security and social programs