You are presented with the quiz "The transfer of pollen to what is the fertilization step of the sexual reproduction of a plant?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "pollination is the fertilization step in the sexual reproduction of plants" and "pollination is the transfer of pollen grains to a stigma". 

So, what's the best answer to the question?


 

 stigma          