Q: You are given a paragraph (Passage), a question (Question) and two answer options (Option1 and Option2). Your task is to find the correct answer (and return the string of the correct option, not option1/2) for the given question from the given options and based on the given passage. Answer of the question can be found directly from the passage.
Passage: On a Mother 's Day morning , I decided that I was going to cook for my wife . She really loves to eat German pancakes , and so I decided that I would wake up early that Sunday and make her some food that she enjoys . I got a bowl out to mix the ingredients . I put in six or seven eggs , a cup of flour , and a cup of milk to make sure it stayed runny . When I mixed them with a fork , I made sure that all the of the ingredients were mixed together . I melted butter in the glass pan and then poured the ingredients in the pan . When the oven was done heating , I put the pan in for over ten minutes . After it was done , I woke her up and we ate the food I made together . Question: What started to heat? Option1: the furnace Option2: oven
A:
oven