<prompt> The most common cause of the congenital heart defect is:A viral infection in mother during first trimesterA bacterial infection in mother during first trimesterConsumption of NSAIDs by mother during first trimesterNone of the above  <response>: Congenital heart disease is not uncommon, occurring in about 8 of every 1000 live births.One of the most common causes of congenital heart defects is a viral infection in the mother during the first trimester of pregnancy, when the fetal heart is being formed.Defects are particularly prone to develop when the expectant mother contracts German measles; thus, obstetricians may advise termination of pregnancy, if German measles occurs in the first trimester. 