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

Which of the following definitions best describes 'alpha-D-Galp-(1->2)-alpha-D-Galp-(1->6)-alpha-D-Galp-(1->3)-[alpha-D-Manp-(1->2)-alpha-D-Manp-(1->6)]-alpha-D-Manp'?

A. A branched hexasaccharide consisting of alpha-D-Man at the reducing end having alpha-D-Gal-(1->6)-[alpha-D-Gal-(1->2)]-alpha-D-Gal and alpha-D-Man-(1->2)-alpha-D-Man groups attached at the 3- and 6-positions respectively.
B. A branched hexasaccharide consisting of alpha-D-Man at the reducing end having alpha-D-Gal-(1->2)-alpha-D-Gal-(1->6)-alpha-D-Gal and alpha-D-Man-(1->2)-alpha-D-Man groups attached at the 3- and 6-positions respectively.
C. A hexasaccharide consisting of three alpha-D-mannosyl residues linked sequentially (1->3), with two mannosyl residues also having linked (1->2) to beta-D-xylopyranosyl residues and the third mannosyl residue linked ((1->2) to a beta-D-glucopyranuronosyl residue. It is a motif found in the capsule of Cryptococcus neoformans.
D. A branched hexasaccharide comprised of five alpha-D-mannose residues linked as shown and also to a 3-deoxy-alpha-D-manno-oct-2-ulosonic acid (3-deoxy-D-manno-oct-2-ulosonic acid; Kdo) residue at the reducing end, corresponding to the core oligosaccharide of the phytopathogenic bacterium Rhizobacterium radiobacter strain Rv3.

Answer: A branched hexasaccharide consisting of alpha-D-Man at the reducing end having alpha-D-Gal-(1->2)-alpha-D-Gal-(1->6)-alpha-D-Gal and alpha-D-Man-(1->2)-alpha-D-Man groups attached at the 3- and 6-positions respectively.