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
Cervical incompetence is characterised by:a) 1st trimester abortionb) 2nd trimester abortionc) Premature rupture of membraned) Circlage operation done 
Select and explain. 
A. bcd, B. acd, C. ac, D. bd
A: bcd
Answer: A: bcd 
Explanation: None