Table 73
the Following Data Were Obtained by Incubating the Bacteria

Table 7.3
The following data were obtained by incubating the bacteria in nutrient medium + disinfectant for 24 hr, then transferring one loopful to nutrient medium (subculturing.) $\quad\quad\quad\quad\quad\quad\quad\quad \underline{\text { Doom} } \quad \quad\quad\quad\quad\quad\quad\underline{K O}$
$\begin{array}{rrrrr}\text { Dilution } & \text { Initial } & \text { Subculture } & \text { Initial } & \text { Subculture } \\1: 16 & - & + & + & + \\1: 32 & - & + & + & + \\1: 64 & - & + & + & + \\1: 128 & + & + & + & +\end{array}$

$\quad\quad\quad\quad\quad\quad\quad\quad \underline{\text { Mortum }} \quad\quad\quad\quad\quad\quad \underline{\text { Sterl }}$
$\begin{array}{rrrrrr}\text { Dilution } & \text { Initial } & \text { Subculture } & \text { Initial } & \text { Subculture } \\1: 16 & - & - & - & + \\1: 32 & - & + & + & + \\1: 64 & + & + & + & + \\1: 128 & + & + & + & +\end{array}$
-In Table 7.3, which disinfectant was bactericidal?

A) Doom
B) K.O.
C) Mortum
D) Sterl
E) Can't tell