Sitting in a row in front of a camera, Mr. X on the left of the person sitting in the centre but is on the right of Mr. Y.
Mr. P is on the right of Mr. Z and Mr. R is on the right of Mr. P.
Mr. R is the second person from the person sitting in the centre. Who is the person sitting in the centre ? 

Answer: C. Mr. Z

Mr. X is on the right of Mr. Y and on the left of person in the centre  i.e. Y, X, ---
Mr. P is on the right of Mr. Z and Mr. R is on the right of Mr. P  i.e.  Z, P, R.
R is second from the person sitting in the centre.
So, the order is Y, X, Z, P, R.
Clearly, Z is sitting in the centre.