Needs STATISTICS advice?

I have survey results I need to yze. I'm looking at the responses of two independent populations. The answers to the question I'm yzing are categorical, meaning that the respondent could've chosen answer A, B, C, E, or E. I want to look at the % of respondents in each category in one population, and compare to the other population, and determine whether there are any statistically significant differences. What statistical methodology should I use? Two-sided Z-test? Chi-squared? T-test? HELP!