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

Which of the following definitions best describes 'beta-D-gulose'?

A. An alkyl,acyl-sn-glycero-3-phosphocholine in which the alkyl or acyl groups at positions 1 and 2 contain a total of 42 carbons and 4 double bonds.
B. A D-gulopyranose with an alpha-configuration at the anomeric position.
C. A D-gulopyranose with a beta-configuration at the anomeric position.
D. A penicillin in which the substituent at position 6 of the penam ring is a phenylacetamido group.

Answer: A D-gulopyranose with a beta-configuration at the anomeric position.