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: Unknown
[{'content': 'Shape of nulliparous cervix is: \nSelect and explain. \nA. Transverse, B. Longitudinal, C. Circular, D. T shaped', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Shape of nulliparous cervix is circular the cervix is spindle shaped and measures 2.5 cm. It is bounded above by internal os\xa0 and below by external os. In nulliparous women the external os is circular whereas parous cervix is characterized by a\xa0 transverse slit.', 'role': 'assistant'}]