Customizing questions environment in exam class

How can I make custom questions using exam class? For e.g., I need to create 3 different questions, but with labels A1, B1 and C1 and possibly with different color.

Something like this

begin{questions}

Aquestion
This question starts with item label A1, and the text of this question is in blue color.

Aquestion

This question starts with item label A2, and the text of this question is in blue color.

Bquestion

This question starts with item label B1, and the text of this question is in red color.

Cquestion

This question starts with item label C1, and the text of this question is in green color.

Bquestion

This question starts with item label B2, and the text of this question is in red color.

end{questions}