The prostaglandins are a group of lipids which are made at sites of tissue damage or infection. They are involved in dealing with injury and illness. Unlike hormones, which circulate in the blood to influence distant tissues, prostaglandins act locally especially in the regions where they are produced hence the name 'local hormones'. They control processes like inflammation, blood flow, the formation of blood clots and the induction of labor. Thus, the correct answer is option A.