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

Which of the following definitions best describes 'HexCer(d16:1(4E,15Me)/26:0(OH))'?

A. Conjugate base of bkas#20-CoA
B. Conjugate base of ascr#31-CoA
C. A hexosyl ceramide with C17iso branched chain sphingoid base and C26:0(OH) N-Acyl. Sum formula is C49H95NO9
D. Organometallic coordination compounds in which one atom of a transition metal such as iron, ruthenium or osmium is bonded to and only to the face of two cyclopentadienyl [eta(5)-(C5H5)] ligands which lie in parallel planes. The term should not be used for analogues having rings other than cyclopentadienyl as ligands.

Answer: A hexosyl ceramide with C17iso branched chain sphingoid base and C26:0(OH) N-Acyl. Sum formula is C49H95NO9