This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach, Subject name: Anatomy
[{'content': 'Cardiac end of stomach lies at which rib? \nSelect and explain. \nA. 8th rib, B. 7th rib, C. 9th rib, D. 10th rib', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) 7th ribRef: Essentials of Anatomy IB singh 2nd ed. / 304', 'role': 'assistant'}]