This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs in Pregnancy, Subject name: Gynaecology & Obstetrics
All are Pharmacological methods of cervical ripening except? 
Select and explain. 
A. Pge2, B. Pge1, C. Mifepristone, D. Transcervical Catheter
D: Transcervical Catheter
Answer: D: Transcervical Catheter 
Explanation: Pharmacological method Non pharmacological method 1. Dinoprostone gel (pge2) 1. Stripping of membrane 2. Misoprostol (pge1) 2. Mechanical dilators - Transcervical catheter and Osmotic dilators 3. Mifepristone 3.Extra-amniotic saline infusion During cervical ripening,Collagen fibril diameter and proteoglycan and glycosaminoglycan within the matrix is increased.