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].
Q: (CNN) Russia said one of its airstrikes in Syria killed ISIS spokesman Mohammad al-Adnani -- a claim that a US official called preposterous. On Wednesday, Russia's Ministry of Defense announced it killed the terror leader on the ministry's official Facebook page. It said Adnani was one of up to 40 ISIS militants killed by a Russian bomber in Aleppo province. But a US defense official slammed Russia's assertion. "It would be laughable but for the very real humanitarian suffering Russia has inflicted," the defense official said Wednesday. "We stand by the statement we made yesterday. We conducted a strike that targeted al-Adnani. We are assessing the results of that strike."A drone controlled by the US targeted ISIS leader, US defense officials told CNNUS official: Russia's claim would be "laughable" if it weren't for "humanitarian suffering Russia has inflicted"Mohammad al-Adnani had urged lone-wolf attacks against countries launching strikes against ISIS 
 Question:On Tuesday, ISIS announced _'s death in a rare public statement.
A: 
Adnani