Discussion
The common phenolic components of hydrolysable tannins
Answer: D
The common phenolic components of hydrolysable tannins are all of the above.
Hydrolysable tannins are esters of a sugar (usually glucose) with phenolic acids. On hydrolysis they give gallic acid (gallotannins), its dimer digallic acid, and ellagic acid (ellagitannins). Myrobalan and oak galls are rich sources.
Since gallic, digallic and ellagic acids are all components, choosing only one of them would be incomplete.
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