Important trisaccharides present in insect blood is

Answer: Option D

Important trisaccharides present in insect blood is Melisitose.
Melezitose, also spelled melicitose, is a nonreducing trisaccharide sugar that is produced by many plant sap eating insects, including aphids such as Cinara pilicornis, by an enzyme reaction.
This is beneficial to the insects, as it reduces the stress of osmosis by reducing their water potential. It can be partially hydrolyzed to glucose and turanose the latter of which is an isomer of sucrose.