<prompt> Which is produced by Phaeochromocytoma in M.E.N 2A Sipple syndrome?EpinephrineNorepinephrineDopamine5- H.I.  <response>: Ans. a EpinephrineRef: Robbins pathology 9th ed. 1134-36 Phaeochromocytoma 5 cm and associated with MEN 2A can produce epinephrine due to sufficient methy transferase enzyme. However if phaeochromocytoma 5 cm and in extradrenal phaeochromocytoma due to absence of methyl trans- ferase enzyme, only nor-epinephrine is produced. 