What is the right answer? I'm going to assume that what you're making is something like a quiz. If so:
You have two main options. Either radio buttons (the ones with a circle beside them) or normal buttons. Personally I would use radio buttons, but for a beginner normal buttons are probably easier.
Buttons: Say there are four possible "answers" to your question (You can't have an answer without a question!). For each one, make a button. You can do this in Visual C#'s GUI form creation.
Name each button aptly. The naming is up to you, but I would call them code names such as "Button1", "Button2", etc. as I find it easier to catalogue them later.
Next double click on a "wrong" button. You will be taken to a code editor which is using the "Button1"_Click method (If you called it "Button1" that is...). In here you put what happens if the user clicks Button1. Repeat this for each button.
That's probably the easiest way of doing it. However, it looks rather messy on screen. You can change the shape, size and colour of the buttons to make them look more attractive, or use radio buttons.
Radio Buttons: Make 4 radio buttons in the Visual C# GUI, and name them appropriately. Now you will have to make a button down the bottom of the form, which the user clicks to submit their answer. Name this button.
Double-click on this button. Again you will be taken to a block of code which is executed when the user clicks the button. In here you will need to put code such as:
if ("RadioName".Selected == true)
{
// Put Code to be executed if RadioButton1 is executed here
}
At least I think it's .Selected...You'll see it anyway
That's a basic example of what you would need to do...Then again I could have been completely wrong in my Quiz assumptions...