An young man previously diagnosed as a case of congenital heart disease lift to right shuvy has a very loud pansystolic murmur at the left sternal edge without any haemodynamic disturbance.He is likely to be having -

• A. Atrial septal defect
• B. Large ventricular septal defect
• C. Small ventricular septal defect
• D. Eisenmenger's syndrome