According to the nursery rhyme, what fruit did Little Jack Horner pull out of his Christmas pie?

Little Jack Horner pulled out a plum from his Christmas pie according to the nursery rhyme. This is evident in the line "He stuck in his thumb, and pulled out a plum," which describes the action of Jack inserting his thumb into the pie and pulling out a plum as his reward. The use of the word "plum" indicates that this particular fruit was hidden within the pie, making it the answer.