Each of the following is a risk factor for Tetralogy of Fallot EXCEPT:

Maternal alcohol use, smoking, and certain nutritional deficiencies are linked to increased risk of congenital heart defects including Tetralogy of Fallot. Folic acid SUPPLEMENTATION, however, is protective against many congenital anomalies (including some congenital heart defects) — it is not a risk factor, making it the exception (a folic acid DEFICIENCY, not supplementation, would be the risk factor).