<prompt> What is first external sign of decomposition of dead body -Decomposition of liver and intestineGreenish discoloration over right iliac fossaGreenish discoloration over dependent pasBlood stained froth from mouth  <response>: The first external sign of putrefaction in body is greenish discolouration over right iliac fossa, caecum where the contents are more fluid and full of bacteria. Dr. Narayana Reddys Synopsis of Forensic Medicine Toxicology 27 th edition pg. 82. 