IBPS RRBs Officer Scale II and III Sep 2013 Paper

If it is possible to make only one meaningful English word with the second, the fifth, the sixth and the tenth letters of the word STREAMLINE, which of the following will be the third letter of that word ? If no such word can be made,give ‘X’ as the answer and if more than one such word can be made, give ‘Y’ as the answer.