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A 19-year-old male presents to a psychiatrist with ‘learning difficulties’ after he has failed his school-leaving exams again. For 2 years he has been making different types of lists of unimportant things. He feels a constant compulsion to check if he has written everything down in the correct order. He counts the number of words he has written down. He repeatedly reads them out in a particular order. Also, he segregates and reorders the sheets with his notes many times a day. The above activities take up as many as 10 hours a day. As he does not have much time left, he has cut down on socialising, has been neglecting learning and spending most of his time in his bedroom. Which drug should be administered to this patient?