question: Q:A 14-year-old boy is brought in to the clinic by his parents for weird behavior for the past 4 months. The father reports that since the passing of his son's pet rabbit about 5 months ago, his son has been counting during meals. It could take up to 2 hours for him to finish a meal as he would cut up all his food and arrange it in a certain way. After asking the parents to leave the room, you inquire about the reason for these behaviors. He believes that another family member is going to die a “terrible death” if he doesn’t eat his meals in multiples of 5. He understands that this is unreasonable but just can’t bring himself to stop. Which of the following abnormality is this patient's condition most likely associated with?? 
  {'A': 'Atrophy of the frontotemporal lobes', 'B': 'Atrophy of the hippocampus', 'C': 'Decreased level of serotonin', 'D': 'Enlargement of the ventricles', 'E': 'Increased activity of the caudate'},