<prompt> cAMP is the exclusive second messenger for all the following exceptCoicotrophinDopamineGlucagonVasopressin  <response>: cAMP is the second messenger for dopamine, coicotrophin and glucagon. Vasopressin ADH acts on atleast 3 kinds of receptors: V-1A, V-1B, V2. All the 3 are G-protein coupled receptors. V-1A and V-1B receptors Gq act through IP3 as a second messenger, to increase the intracellular calcium concentration. V2 receptors Gs use cAMP as a second messenger. Dopamine has 5 receptors D1, D2, D3, D4, D5 All use cAMP as second messengers. D1, D5 act by increasing cAMP. D2, D3, D4 act by decreasing cAMP. Coicotrophin ACTH and glucagon use cAMP as a second messenger. Ref: Ganongs Medical physiology 26th edition PGno: 685 