Uterus is incorrect because it refers to a different organ, substance, process, or medical association. Ovary is also incorrect; it may be biologically important, but its principal role or defining feature is not the one being tested here. Cervix is incorrect because its function, source, target, or disease relationship does not match the question. Therefore option C, Fallopian tube, is factually consistent with the stem, the marked correct index, and the explanation. Fertilization normally occurs in the fallopian tube (usually in the ampulla region). The fertilized egg then travels to the uterus for implantation.