This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal obstruction, Subject name: Surgery
[{'content': 'The least common type of intussusceptions is: \nSelect and explain. \nA. Multiple, B. Colocolic, C. Ileoileal, D. Ileoileocolic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Types of Intussusceptions (in decreasing order) Ileocolic (77%) Ileo-ileo-colic (12%) Ilioileal (5%) Colocolic (2%): MC in adults Multiple (1%) Retrograde (0.2%)', 'role': 'assistant'}]