This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'What is the use of this instrument? \nSelect and explain. \nA. Create pneumoperitoneum by open method, B. Drain hydatid cyst, C. Suction cannula, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Create pneumoperitoneum by open method* Hassan cannula used in creating pneumoperitoneum by open method* The risk of Vascular injury is less with Open method but the risk of bowel injury is same or high as compared to closed technique using Veress needle', 'role': 'assistant'}]