Question: The Chengdu J-20 is what type of aircraft that is designed to avoid detection, and whose technology likely began in Germany during World War II?
Sentence (from "Stealth aircraft"): Well-known modern examples of stealth of U.S. aircraft include the United States' F-117 Nighthawk (1981–2008), the B-2 Spirit, the F-22 Raptor, and the F-35 Lightning II.
Relevant evidence: No