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

Which of the following definitions best describes 'omega-3 fatty acid'?

A. A family of polyunsaturated fatty acids that have in common a final carbon-carbon double bond in the omega-3 position, i.e., the third bond from the methyl end of the fatty acid.
B. A polyunsaturated fatty acid whose structure contains double bonds at any four positions of a 30-carbon straight chain.
C. A leukotriene that is leukotriene B4 bearing an additional oxo substituent at position 20.
D. A polyunsaturated fatty acid that is hexadecanoic acid with unsaturation at positions 4, 7, 10 and 13. It is found in Daphnia galeata.

Answer: A family of polyunsaturated fatty acids that have in common a final carbon-carbon double bond in the omega-3 position, i.e., the third bond from the methyl end of the fatty acid.