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': "True about cervical incompetence is all except: \nSelect and explain. \nA. 1st trimester aboion, B. Hegar's dilator can be passed in non pregnant state, C. History of trauma, can preceede, D. 2nd trimester aboion", 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1st trimester aboion', 'role': 'assistant'}]