This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
[{'content': 'SIS stands for- \nSelect and explain. \nA. Saline infused sonography, B. System induced safety, C. Saline infusion syndrome, D. Self inflicted stab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SIS stands for- Saline infused sonography. USG used to evaluate tubal patency.', 'role': 'assistant'}]