Table 201
the Following Data Were Obtained from a Broth Dilution

Table 20.1
The following data were obtained from a broth dilution test. $\begin{array}{|l|l|l|}\hline\text { Concentration of AntibioticX } & \text { Growth } & \frac{\text { Growth in }}{\text { Subculture }} \\\hline 2 \mu \mathrm{g} / \mathrm{ml} & + & + \\\hline 10 \mu \mathrm{g} / \mathrm{ml} & - & + \\\hline 15 \mu \mathrm{g} / \mathrm{ml} & - & - \\\hline 25 \mu \mathrm{g} / \mathrm{ml} & - & - \\ \hline\end{array}$
-5) In Table 20.1, as illustrated by the data shown, the minimal bactericidal concentration of antibiotic X is

A) 10 ?g/ml.
B) 2 ?g/ml.
C) 25 ?g/ml.
D) 15 ?g/ml.
E) The answer cannot be determined based on the information provided.