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
Best tocolytic in a cardiac patient is 
Select and explain. 
A. Atosbian, B. Isoxsuprine, C. Nifedipine, D. MgSO4
A: Atosbian
Answer: A: Atosbian 
Explanation: Atosiban is oxytocin antagonist and best tocolytic in cardiac patients. B agonists and Calcium channel blockers are contraindicated in hea disease complicated pregnancies.