Definition: This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.
Input: Passage: Napoleon acknowledged one illegitimate son: Charles Leon (18061881) by Eleonore Denuelle de La Plaigne. Alexandre Colonna-Walewski (18101868), the son of his mistress Maria Walewska, although acknowledged by Walewska's husband, was also widely known to be his child, and the DNA of his direct male descendant has been used to help confirm Napoleon's Y-chromosome haplotype. He may have had further unacknowledged illegitimate offspring as well, such as Eugen Megerle von Muhlfeld by Emilie Victoria Kraus and Helene Napoleone Bonaparte (18161907) by Albine de Montholon. Question: DNA from Alexandre Colonna-Walewski's descendants has been used to confirm what attribute of Napoleon's?
Output:
Napoleon's Y-chromosome haplotype