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All the following works are the earliest in its field EXCEPT .
A.
Huangdi Neijing (Huangdi’s Internal Classic) .
B.
Nan Jing (Classic of Difficulties) .
C.
Zhubing Yuanhou Lun (Treatise on Causes and Manifestations of Various Diseases).
D.
Zhenjiu Jiayi Jing (A-B Classics of Acupuncture and Moxibustion) .