This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': "True about ureter's entry into bladder \nSelect and explain. \nA. At medial angle of trigone, B. At lateral angle of trigone, C. Make an angle, D. Is straight", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The Urinary System: Ureter and Urinary Bladder. Ureters are 10 inch long tubes that carry urine from kidneys into urinary bladder. Their oblique entry into the bladder prevents backflow of urine and increased pressure within the bladdercompresses the distal ends of the ureters shut . Ref - BDC vol2 6e pg318', 'role': 'assistant'}]