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Fatty acids
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
Rules
If you care about who is factually correct, then it's person 2 and 4:
Palmitic acid (hexadecanoic acid in IUPAC nomenclature) is a fatty acid with a 16-carbon chain. It is the most common saturated fatty acid found in animals, plants and microorganisms.
(Although person 3 is correct in that it is a carboxylic acid. It doesn't exclude the other terms though.)