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: Gynaecology & Obstetrics
[{'content': 'Goniometer is used for \nSelect and explain. \nA. Amount o vaginal secretions, B. To measure width of genital mhiatus, C. Gonococcal colony count, D. Urethrovesical Angle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Goniometer\n\nIt is used to measure baseline urethral angle and maximum strain angle of urethra with a cotton tip swab in place\nThe bladder forms an angle of 100 degree with posterior urethral wall which is also responsible for maintaining urinary continance', 'role': 'assistant'}]