John is 17 and has been drinking heavily since he was 12. He drinks almost every day, but when he is particularly anxious, he drinks until he passes out. Recently, John has been diagnosed with a bleeding ulcer in his stomach. His father and his grandfather were diagnosed alcoholics but his mother and older brother do not drink at all, and they have always told John that he is the family’s rebellious black sheep. John says he is fine and can stop drinking any time, he just does not feel like it. Explain John’s behaviour using the "Disease Model"/Biological approach. What would be the course of treatment for John using this approach?