单项选择题

A.ED<sub>50</sub>/LD<sub>50</sub>
B.LD<sub>5</sub>/ED<sub>95</sub>
C.ED<sub>95</sub>/LD<sub>5</sub>
D.TD<sub>50</sub>/ED<sub>50</sub>
E.LD<sub>50</sub>/ED<sub>50</sub>