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?

<P0-S0> Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology. <P0-S1>  Development of stealth technology likely began in Germany during World War II, the prototyped Horten Ho 229 was designed for twin BMW 003 jet engines but finally powered by twin Junkers Jumo 004 jet engines being described as the first stealth aircraft. <P0-S2>  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. <SEP> <P1-S0>  The J-20 made its maiden flight on 11 January 2011, but the plane was officially revealed on China International Aviation & Aerospace Exhibition in 2016. <P1-S1>  In March 2017, Chinese media claimed that the aircraft has entered initial operational capability phase with limited service within Air Force. <P1-S2> The Chengdu J-20 () is a stealth, twinjet, fifth-generation fighter aircraft developed by China's Chengdu Aerospace Corporation for the People's Liberation Army Air Force (PLAAF). <SEP> <P2-S0> The Boeing B-29 Superfortress is a four-engine propeller-driven heavy bomber designed by Boeing, which was flown primarily by the United States during World War II and the Korean War. <P2-S1>  It was one of the largest aircraft operational during World War II and featured state of the art technology. <P2-S2>  Including design and production, it was the single most expensive weapons project undertaken by the United States in World War II, exceeding the cost of the Manhattan Project by between $1 and 1.7 billion. <P2-S3>  Innovations introduced included a pressurized cabin, dual-wheeled, tricycle landing gear, and an analog computer-controlled fire-control system that directed four remote machine gun turrets that could be operated by a single gunner and a fire-control officer. <P2-S4>  A manned tail gun installation was semi-remote. <P2-S5>  The name "Superfortress" continued the pattern Boeing started with its well-known predecessor, the B-17 Flying Fortress. <P2-S6>  Designed for the high-altitude strategic bomber role, the B-29 also excelled in low-altitude nighttime incendiary bombing missions. <P2-S7>  One of the B-29's final roles during World War II was carrying out the atomic bomb attacks on Hiroshima and Nagasaki. <SEP> <P3-S0> The North China Type 19 (北支一九式拳銃) was a military sidearm produced during World War II by the Empire of Japan. <P3-S1>  Produced in China during the final stages of World War II, the North China Type was most likely made in an effort to supply troops based in Manchuria when supply lines from Japan became disrupted by Allied submarines and bombing. <P3-S2>  Officially approved by the Chief of the Ordnance Bureau, the Type 19 is very scarce with only eleven surviving examples known. <P3-S3>  The pistol appears to be a redesign of the Type 14 Nambu pistol but all pertinent ordinance records lost during World War II.