Choose the correct description of the ingredient of tea.A.) 15-30% of L-Theanine is present in the tea shoots, and there is a high L-theanine content in the second and third leaves.B.) Black tea contains EGCG and ECG, which green tea does not contain much.C.) Black tea contains theaflavin, a family of polyphenols which can also be found in green tea. D.) The combination of L-theanine and caffeine improves cognitive performance.E.) The combination of L-theanine and catechins removes the negative effect of tannins.

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