Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'ascr#28'?

A. A fatty acid ester obtained by formal condensation of the carboxy group of octadecanoic acid with the hydroxy group of 12-hydroxyoctadecanoic acid.
B. A dihydroxyflavanone that is flavanone substituted by hydroxy groups at positions 5 and 7 and a 6-carboxy-1-phenylhex-1-en-3-yl group at position 6.
C. An omega-hydroxy fatty acid ascaroside obtained by formal condensation of the alcoholic hydroxy group of 11-hydroxyundecanoic acid with ascarylopyranose (the alpha anomer). It is a metabolite of the nematode Caenorhabditis elegans.
D. An (omega-1)-hydroxy fatty acid ascaroside obtained by formal condensation of the alcoholic hydroxy group of (15R)-15-hydroxypalmitic acid with ascarylopyranose (the alpha anomer). It is a metabolite of the nematode Caenorhabditis elegans.

Answer: An (omega-1)-hydroxy fatty acid ascaroside obtained by formal condensation of the alcoholic hydroxy group of (15R)-15-hydroxypalmitic acid with ascarylopyranose (the alpha anomer). It is a metabolite of the nematode Caenorhabditis elegans.