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
All are used in preterm labour to decrease uterine contractility except: 
Select and explain. 
A. Methyl alcohol, B. Ritodrine, C. Magnesium sulphate, D. Dexamethasone
D: Dexamethasone
Answer: D: Dexamethasone 
Explanation: None