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

Which of the following definitions best describes '(2R)-2-{(1R)-1-hydroxy-15-[2-(20-methoxy-21-methylnonatriacontyl)cyclopropyl]pentadecyl}hexacosanoic acid'?

A. A C85 alpha-mycolic acid produced by Mycobacterium tuberculosis having a C58 meromycolic chain with one cis cyclopropyl function, one methoxy function and one methyl subsituent, and a saturated C24 alpha-branch.
B. A C78 alpha-mycolic acid having a C52 meromycolic chain with two cis cyclopropyl functions and a saturated C26 alpha-branch. It is produced by Mycobacterium tuberculosis H37Ra.
C. A hydroxy fatty acid that is palmitic (hexadecanoic) acid substituted with one hydroxy group.
D. A hydroxy fatty acid obtained by hydroxylation of one of the two terminal methyl groups of isoheptadecanoic acid.

Answer: A C85 alpha-mycolic acid produced by Mycobacterium tuberculosis having a C58 meromycolic chain with one cis cyclopropyl function, one methoxy function and one methyl subsituent, and a saturated C24 alpha-branch.