In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Article: Eddie liked music very much when he was at school, but when he went to the university he decided to study medicine instead of music. When he passed his examinations and became a doctor, he had to work in a hospital for some time. There he discovered that a lot of patients were happier and caused less trouble if pleasant music was played to them When Eddie got an office and began to work for himself, he decided to keep his patients happy by having a tape recorder in his waiting-room play beautiful music for them. But soon after the tape recorder had been put in, Eddie's nurse heard a woman, who was sitting in the crowded waiting-room one morning, complained, "Here we're all waiting to see the doctor, and he's just playing the violin in his office instead of doing his work."
Question: Eddie became a student of medicine at university _ .
Options: (A) because he had lost interest in music (B) because he thought medicine was more important than music (C) to find out new use of music in hospital (D) for reasons unknown from this passage
D