Role based post view

Hi!

Is it possible to make the posts view-able as per the role(s). For example, i have 3 new custom roles (A, B, C) with read capability and i have 10 posts. i need post readability based on the role i.e. if i assign post 1, 2, 3, 4 to role A then only role a user can access or read the posts other roles(users) will be restricted.

Is this possible?

Let me know your views.