Direction (Next three Questions): Fifty books belonging to different subjects viz. History (8), Geography (7), Literature (13), Psychology (8), Science (14) are placed on a shelf. They are arranged in an alphabetical order subject to the condition that no two books of the same subjects are placed together so long as books of other subjects are available. Unless otherwise mentioned all counting is done from the left.

Question:- Which subject the 40th book belongs to?