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: Unknown
Highest mortality in pregnancy - 
Select and explain. 
A. Eissenmenger syndrome, B. Fallot's tetrology, C. Coarctation of aorta, D. Marfan's syndrome
A: Eissenmenger syndrome
Answer: A: Eissenmenger syndrome 
Explanation: Ans: A