TGL is the starting material for the biosynthesis of quinine. What is the stereochemical designation at the chiral center of TGL? A.cisB.transC.SD.R

The question seems to be incomplete as the compound "TGL" is not clearly defined in the context of quinine biosynthesis. Additionally, the options provided (cis, trans, S, R) are not applicable to a single chiral center without a given structure. The cis/trans nomenclature is typically used for describing geometric isomerism in alkenes, while the R/S system is used for designating absolute configuration of chiral centers in molecules. Without a specific structure or more information, it's not possible to determine the stereochemical designation at the chiral center of "TGL".