This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'A 16 years old female patient has abdominal lump that is movable and painless, upon exploratory laparotomy a cystic lump is found arising from mesentery, diagnosis is \nSelect and explain. \nA. Enterocele, B. Mesenteric cyst, C. Choledochal cyst, D. Pancreatic pseudocyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Mesenteric cystMesentric cyst present asA painless abdominal swellingThe swelling moves freely in a plane at right angles to the attachment of the mesentry.Recurrent attacks of abdominal pain with or without vomiting due to obstructive symptoms.', 'role': 'assistant'}]