FIVE OF THESE THINGS ARE NOT LIKE THE OTHERS.
Cabernet Franc and Merlot are grape varieties from Bordeaux. Pinot Noir is a Burgundy variety. Viognier is a Rhone variety but is not allowed in Chateauneuf-du-Pape. Zinfandel, of course, is a California variety that is closely related to Primitivo, from Italy. There are many alternate spellings and names for the various varieties.
The five additional varieties that ARE ALLOWED in Chateauneuf-du-Pape are:
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