Randomization PCOS women who are eligible and fulfilling the criteria of the study will recruit. After they had given inform consent, they will assigned to one of the groups of sealed opaque envelope labelled as C and L. Women in group C will assigned CC 100mg and those in L assigned Letrozole 2.5 mg. The randomization will be done by computer- generated randomization using http://www.randomization.com according to the random sequence.