<qa>  What is the chance that you receive topiramate and placebo?If you continue to meet eligibility requirements for the study, you will enter the study. You will be assigned by chance to one of two treatment groups. You may receive either topiramate or placebo an inactive substance. This makes the assessment of the study drug much fairer. The chances you are receiving the study drug versus placebo are 1 to 1 or equal 50 chance that you will receive topiramate and 50 chance that you will receive placebo. 