Final answer:
Selective serotonin reuptake inhibitors (SSRIs) are the drug class used to treat depression, enhancing serotonin activity in the brain.
Step-by-step explanation:
The correct drug classification indicated for the treatment of depression is B. Selective serotonin reuptake inhibitors (SSRIs). SSRIs, such as Prozac, Zoloft, and Paxil, function by blocking the reuptake of the neurotransmitter serotonin in the brain, which enhances its availability and activity in the synaptic cleft. Serotonin is linked with mood regulation, and increased levels can lead to reduced symptoms of depression. SSRIs are favored over older antidepressants like tricyclic antidepressants and monoamine oxidase inhibitors due to their favorable side effect profile and efficacy in alleviating depressive symptoms. Furthermore, SSRIs may also be beneficial in other conditions such as obsessive-compulsive disorders (OCD), demonstrating their versatility in treating various mood-related disorders.
The final answer in two line explanation: SSRIs are the class of drugs indicated for treating depression, working by increasing serotonin levels in the brain to improve mood.