题目内容

In _______, J. W. Trevan devised the LD50 test as a way of standardizing biological therapeutics. In this test, fifty to a hundred animals are dosed with the test substance so that approximately half die within two weeks. From this, a median lethal dose with statistical confidence limits can then be calculated.

A. 1917
B. 1923
C. 1927
D. 1935

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