Which of the following grapes are used to make white wine: Chardonnay, Sauvignon Blanc, Riesling, Pinot Gris, Semillon, Gewurztraminer, Viognier, Chenin Blanc, Cabernet Sauvignon, 
Merlot, Syrah, Pinot Noir, Zinfandel, Sangiovese, Grenache, Malbec.