Herbs that Clear Heat

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Based on your knowledge of its functions, what are the properties of Sheng Di Huang (rehmanniae radix)?

Cold, bitter, sweet
Cold, acrid
Warm, acrid, bitter
Hot, acrid, toxic

Sheng Di Huang is in the category Herbs the Cool the Blood, so it is cold in temperature. It clears heat, so it is bitter in flavor. It also tonifies yin, so it is also sweet in flavor.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 120 [Q533]