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In which book was the four flavors of drugs first put forward?
This statement was first put forward in Shennong Herbal Classic.

Shennong Ben Cao Jing is the earliest existing pharmacological monograph in China, which divides drugs into four flavors: cold, hot, warm and cool, and the five flavors are sour, bitter, sweet, pungent and salty. This classification laid a foundation for future generations to understand and apply the medicinal properties of traditional Chinese medicine.