问题
单项选择题
A student conducts an experiment in biology lab and discovers that the ratio of the number Of insects in a given population having characteristic X to the number of insects in the population not having characteristic X is 5:3, and that 
of the insects having characteristic X are male insects. What proportion of the total insect population are male insects having the characteristic X ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：D