Ten people are sitting in two parallel rows containing 5 people each in such a way that there is equal distance between adjacent persons.
In row 1 - A, B, C, D and E are seated and all of them are facing south.
In row 2 - P, Q, R, S and T are seated and all of them are facing north.
Thus each person faces another person from the other row.
C sits at an extreme end of the row. Only two people sit between B and C. The person facing B sits to the immediate left of Q. Only one person sits between Q and P. A faces P. A sits to the immediate left of the person facing S. E sits second to the right of the person facing T.
Who faces B?

It is given that C sits at an extreme end of the row. In the arrangement above, we have placed C at the rightmost end of the row. 
B and C have two people sitting between them, and the person opposite B sits to the immediate left of Q. One person sits between Q and P, and A faces P. But A does not sit to the immediate left of the person facing S, since A is sitting at the rightmost end (since they are facing southwards). Thus, C does not sit at the rightmost end of the row. 

Now we will take C at the leftmost end of the row and proceed with the arrangement.

We have taken C at the leftmost end of the row here. This arrangement satisfies all the conditions given in the question. T is sitting opposite B; hence, option A is correct.