<prompt> Which of the following is produced by Carcinoid tumor?G.A.B.ASerotoninEpinephrineNor-epinephrine  <response>: Ans. b SerotoninRef : Harrison 19th ed. 564-65 Argentaffin cells in Carcinoid produce 5HT derivatives like serotonin. Epinephrine and norepinephrine are produced by chromaffin cells which are seen in phaeochromocytoma. 