Preheat oven to 350 degrees F (175 degrees C). Grease a 9x5 inch loaf pan.
In a large bowl, combine flour, baking powder, baking soda, salt and sugar. Make a well in the center and add egg, buttermilk and oil. Mix until just moistened.
Pour batter into prepared pan.
Bake for 45 minutes or until a toothpick inserted into center of the loaf comes out clean.