When the Affordable Care Act marketplaces open Oct. 1, there are bound to be questions about how they will work. | We've been soliciting questions that you have about Obamacare, and we're answering those in this sortable list. | The questions include two of the most frequently asked: "If I'm on Medicare, do I need to sign up for Obamacare?" and "What is the fine if I don't sign up for Obamacare?" We answer those and many others. | Simply use the pull-down menu below to see a category that applies to your circumstances to read the questions and answers that might affect you. (If the menu isn't working for you, try using Firefox or Chrome as your browser instead of Internet Explorer.) If you have a question of your own, please send it to firstname.lastname@example.org.