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
Which does not affect the foetus: 
Select and explain. 
A. Lytic cocktail, B. Magnesium sulphate, C. Warfarin, D. Phenytoin
B: Magnesium sulphate
Answer: B: Magnesium sulphate 
Explanation: None