Eight boys A, B, C, D, E, F, G and H are sitting around a square table facing towards the centre (not necessarily in the same order). Four boys are sitting at the corners and four boys are sitting in the middle of the sides. D is the immediate neighbour of A and B and he is sitting at a corner. G is the immediate neighbour of H and E. F is the sitting in the middle of the side. A is not sitting opposite to F. H is towards the immediate right of
B. Who is sitting diagonally opposite to C?