Table 201
the Following Data Were Obtained from a Broth Dilution

Table 20.1
The following data were obtained from a broth dilution test. $\begin{array}{c}&&\text { Growth in }\\\text { Concentration of Antibiotic } X&\text { Growth }&\text { Subculture }\\\hline2 \mu \mathrm{g} / \mathrm{ml}&+&+ \\10 \mu \mathrm{g} / \mathrm{ml}&-&+ \\15 \mu \mathrm{g} / \mathrm{ml} &-&-\\25 \mu \mathrm{g} / \mathrm{ml}&-&-\end{array}$
-In Table 20.1, the minimal bactericidal concentration of antibiotic X is

A) 15 µg/ml.
B) 25 µg/ml.
C) 2 µg/ml.
D) 10 µg/ml.
E) Can't tell.