This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
In primi, preterm labour, all of the following can be used as Tocolytic except: 
Select and explain. 
A. Ritodnne, B. MgSO4, C. Dexamethasone, D. Propranolol
A: Ritodnne
Answer: A: Ritodnne 
Explanation: Ritodrine is a beta sympathomimetic drug. It was previously used as iv infusion. Now not used because of severe adverse effects like tachycardia and pulmonary edema TEXTBOOK OF OBSTETRICS, SHEILA BALAKRISHNAN, 2nd EDITION pg:195