Question

class of antidepressant drugs that increases availability of serotonin by interfering with its reuptake
selective serotonin reuptake inhibitors (ssris)
selective dihydrofolate reductase inhibitors (ssris)
selective xanthine oxidase inhibitors (ssris)

Explanation:

SSRIs work by specifically inhibiting the reuptake of serotonin, thereby increasing its availability in the synaptic cleft. Selective dihydrofolate reductase inhibitors are related to folate metabolism (e.g., in some antibacterial or antimalarial contexts, not antidepressants). Selective xanthine oxidase inhibitors are used for conditions like gout (to reduce uric acid production, not related to serotonin - based antidepressant action).

Answer:

selective serotonin reuptake inhibitors (SSRIs)