In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".
--------
Question: Right after the Pentagon was hit, NEADS learned of another possible hijacked aircraft. It was an aircraft that in fact had not been hijacked at all. After the second World Trade Center crash, Boston Center managers recognized that both aircraft were transcontinental 767 jetliners that had departed Logan Airport. Remembering the "we have some planes" remark, Boston Center guessed that Delta 1989 might also be hijacked. Boston Center called NEADS at 9:41 and identified Delta 1989, a 767 jet that had left Logan Airport for Las Vegas, as a possible hijack. NEADS warned the FAA's Cleveland Center to watch Delta 1989. The Command Center and FAA headquarters watched it too. During the course of the morning, there were multiple erroneous reports of hijacked aircraft. The report of American 11 heading south was the first; Delta 1989 was the second. NEADS never lost track of Delta 1989, and even ordered fighter aircraft from Ohio and Michigan to intercept it. The flight never turned off its transponder. NEADS soon learned that the aircraft was not hijacked, and tracked Delta 1989 as it reversed course over Toledo, headed east, and landed in Cleveland. But another aircraft was heading toward Washington, an aircraft about which NORAD had heard nothing: United 93. United Airlines Flight 93 FAA Awareness. At 9:27, after having been in the air for 45 minutes, United 93 acknowledged a transmission from the Cleveland Center controller. This was the last normal contact the FAA had with the flight. Less than a minute later, the Cleveland controller and the pilots of aircraft in the vicinity heard "a radio transmission of unintelligible sounds of possible screaming or a struggle from an unknown origin." The controller responded, seconds later: "Somebody call Cleveland?"This was followed by a second radio transmission, with sounds of screaming. <sep>How did the Cleveland controller respond to a transmission that seemed to signify trouble?<sep>"a radio transmission of unintelligible sounds of possible screaming or a struggle from an unknown origin."

Answer: No

Question: Fossils can be used to match up rock layers. As organisms change over time, they look different. Older fossils will look different than younger fossils. Some organisms only survived for a short time before going extinct. Knowing what organisms looked like at certain times also helps date rock layers. Some fossils are better than others for this use. The fossils that are very distinct at certain times of Earths history are called index fossils. Index fossils are commonly used to match rock layers. You can see how this works in Figure 2.30. If two rock layers have the same index fossils, then they're probably about the same age. <sep>What kind of fossils are used to date rock layers?<sep>Index fossils

Answer: Yes

Question: A group of researchers at a remote jungle island outpost discover the natives are practicing voodoo and black magic . After killing the local priest , a voodoo curse begins to raise the dead to feed on the living in retribution . The researchers on the island are killed by the newly risen zombies , except for Jenny , the daughter of a scientist couple . She escapes , protected by an enchanted necklace charm given to her by her mother shortly before her death . She returns years later as an adult with a group of mercenaries to attempt to uncover what happened to her parents . Shortly after arriving at the island their boat 's engine dies , stranding them . Meanwhile elsewhere on the island a trio of hikers discover a cave , the same cave leading to the underground temple where the original curse was created . After accidentally reviving the curse , the dead once again return to kill any who trespass on their island . The mercenaries encounter their first zombie , who injures a member of the team . Taking shelter in the remains of the old research facilities medical quarters they are soon joined by Chuck , the only surviving hiker . Arming themselves with weapons left behind by the long dead research team , they make their stand as the dead once again rise . One by one they are injured or killed , one of whom sacrifices himself to blow up the medical facility and his newly undead team members . Jenny and Chuck flee , the only survivors remaining . They stumble upon the cave once again , where the zombies appear and attack . <sep>Who kills the local priest?<sep>The natives

Answer:
No