44. Which one is the antecedent of ordinary pain-reduction elements?
(A) opiate
(B) yeast
(C) S-reticuline
(D) morphine

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統計： A(9), B(5), C(33), D(24), E(0) #840912

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"...These investigators have not, however, been able to backtrack in yeast beyond a molecule called S-reticuline, which is the hub of the process, in that it can act as the precursor for many morphine-like substances... " 

precursor  n. 先驅/先鋒  

from: Cambridge Dictionary

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