How do you deal with a 2 year old that asks the same question over and over?

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I do not have any children. I have always gotten along with children, and all of my nieces and nephews have, luckily, been good kids. But now, my mom is babysitting a two year old. She drives me crazy. She asks me the same question over and over again, no matter how many times I already answered her. For example, I was cooking an omelette. She asked me "why do you cook an omelette?" and I told her I was hungry. She went on "why do you cook an omelette" and I repeated that I was hungry. She just kept asking me over and over why I cooked an omelette. How am I supposed to deal with her? It wasn't just that question, it is constant, on everything we ever talk about. It's frustrating. I have never been so frustrated with a child before but I just don't know what else to do. I keep telling her the more she asks me, the more I'm going to ignore her. I don't want to be rude, but I can't get anything done or finish a conversation because she is constantly asking me the same question. I wouldn't mind it so much if she was just asking different questions, but the same one bothers me.