This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
True about hea disease in pregnancy 
Select and explain. 
A. In Mitral Stenosis surgery better avoided in pregnancy, B. Mitral Regurgitation - Definite indication for termination of pregnancy, C. Aoic stenosis in old age is due to Bicuspid valve, D. Termination of pregnancy advised in NYHA class II
A: In Mitral Stenosis surgery better avoided in pregnancy
Answer: A: In Mitral Stenosis surgery better avoided in pregnancy 
Explanation: Mitral stenosis : Cardiac surgery is best done before pregnancy; If needed Balloon valvuloplasty is the preferred procedure in second trimester MR is well tolerated in pregnancy because the decreased systemic vascular resistance results in less regurgitation Aoic stenosisis essentially a disease of ageing and hence rare in pregnancy unless associated with congenital lesion like bicuspid aoic valve Termination of pregnancy advised in NYHA class 3 and 4 Reference: Textbook of Obstetrics; Sheila Balakrishnan, 2nd edition; Page no: 236