Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: It was the discovery that finally provided an answer to the greatest murder mystery of all time – the identity of Jack the Ripper. Last year, The Mail on Sunday revealed claims that DNA evidence has proved that the serial killer was Polish immigrant Aaron Kosminski. Now, exclusive photographs of the alleged murderer’s family offer the strongest clues yet to what he looked like. Kosminski was a Polish Jew who had fled to London with his family, escaping the Russian pogroms in the early 1880s. The family album portraits that descendants say are of his sister, Matilda, and brother, Isaac, offer an insight into the Ripper’s respectable family background. Isaac was a successful tailor in Whitechapel, East London, while Matilda was a married mother of nine children.Last year, The MoS showed DNA evidence that Polish immigrant Aaron Kosminski was RipperPhotos of alleged murderer’s family offer strongest clues yet to what he looked likeKosminski was a Polish Jew who had fled to London with his familyThe 19th century portraits show his sister Matilda and brother Isaac 
 Question:The photograph said to be of _’s brother Isaac fits that description.

Aaron Kosminski