Four of the following five are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

From the given above question , we can say that
In row 1, P, Q, R, S and T are seated and all of them are facing south. In row 2, A, B, C, D and E are seated and all of them are facing north.
In all other, the second is the neighbour of the one facing the first.R and A is the one that does not belong to that group .