Use the information given below :
There is a group of five persons - $A, B, C,D,$ and $E$. In the group there is a Professor of Philosophy, a Professor of Psychology and a Professor of Economics. $A$ and $D$ are ladies who have no specialisation in any subject and are married. No lady is a philosopher or economist.There is a married couple in the group of which $E$ is the husband. $B$ is the brother of $C$ and is neither a psychologist nor an economist.
Who is the Professor of Philosophy ?