Suppose How to bake a chocolate cake from scratch<br>Preheat the oven to 350 degrees F. Grease and flour a 9x13 inch pan. In a large bowl, cream together the butter and sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla. Combine flour, cocoa, baking soda and salt; gradually mix into the creamed mixture.
Can we infer that "Vanilla is a key ingredient in baking a chocolate cake"? Yes, no, or maybe?