Question: Operation Cherry Blossoms at Night was a 1945 plan developed an army medical officer born in which year ?
Context: Surgeon General Shirō Ishii (石井 四郎 , Ishii Shirō , ; June 25, 1892 – October 9, 1959) was a Japanese army medical officer, microbiologist and the director of Unit 731, a biological warfare unit of the Imperial Japanese Army involved in forced and frequently lethal human experimentation during the Second Sino-Japanese War (1937–1945). Operation Cherry Blossoms at Night was a 1945 plan developed by Shirō Ishii to wage biological warfare upon civilian population centers in Southern California in the United States during the final months of World War II, using pathogens created by members of Ishii's Unit 731. Walter Perceval Yetts (25 April 1878 – 14 May 1957) was a British surgeon and sinologist.  Born at Reading, England, he was educated at Bradfield College, London University and Lausanne University.  He entered the Royal Navy Medical Service in 1903 and retired with the rank of staff surgeon in 1912.  He was acting medical officer at the British legation in 1913 and served in the Royal Army Medical Corps during World War I. From 1920 to 1927 he was a medical officer in the Ministry of Health.  In 1930 he made a major career change when he was appointed the first lecturer in Chinese art and archaeology at the School of Oriental Studies at London University.  In 1932 he became Professor of Chinese Art and Archaeology at London University and held the post until his retirement in 1946. "Sakura Sakura" (さくら さくら , "Cherry blossoms, cherry blossoms") , also known as "Sakura", is a traditional Japanese folk song depicting spring, the season of cherry blossoms. Contrary to popular belief, the song did not originate in ancient times; it was a popular, urban melody of the Edo period and was adopted as a piece for beginning "koto" students in the Tokyo Academy of Music "Collection of Japanese Koto Music" issued in 1888 (in English) by the Department of Education.  The song has been popular since the Meiji period, and the lyrics in their present form were attached then.  It is often sung in international settings as a song representative of Japan, and many electronic crosswalks in Japan play the melody as "guidance music". "Sakura Nagashi" (桜流し , lit.  "Flowing Cherry Blossoms/Cherry Blossoms Sinking") is a song by Japanese singer-songwriter Hikaru Utada.  It was released digitally November 17, 2012, with a DVD single released 26 December 2012.  The song is the theme to the third film of the "Rebuild of Evangelion" movie series, "", and was later included on her sixth Japanese-language studio album "Fantôme", released in 2016.  The single also marked Utada's last release under the then EMI-controlled EMI Music Japan as the label was absorbed into Universal Music Japan as EMI Records Japan in April 2013. Cherry Blossoms is the oldest and one of the largest international social networking companies in the World today.  It was established in 1974 as a picture catalog specializing in women from Asia.  The agency printed catalogs of "personals" listings, selling addresses to customers who were then left to their own devices in corresponding with and courting the women.  Eventually, photographs supplemented text listings, then color photographs were added.  As of 2001, Cherry Blossoms had evolved entirely to a web-based format.  Circa 2014, friending capability was added. Emiko Ohnuki-Tierney (Japanese: 大貫恵美子 )is an anthropologist who has been working on the question of power of symbols and its absence in political spaces since the mid-1980s.  Her most recent works began as a study of symbolism of cherry blossoms and their viewing in relation to Japanese identities and led to an exploration of the cherry blossom symbol as a major trope utilized to both encourage and aestheticize sacrifice for the country during its military period.  This research culminated in two recent books, "Kamikaze, Cherry Blossoms, and Nationalisms: The Militarization of Aesthetics in Japanese History" and "Kamikaze Diaries: Reflections on Japanese Student Soldiers". Hana wa sakuragi, hito wa bushi (Japanese: 花は桜木人は武士 , literally "the [best] blossom is the cherry blossom; the [best] man is the warrior") is a Japanese proverb that originated in the medieval period.  It is also rendered as "among blossoms the cherry blossom, among men, the warrior" or likewise.  The proverb means that as the cherry blossom ("sakura") is considered foremost among flowers, so the warrior ("samurai", usually referred to in Japanese as "bushi") was foremost among men.  The samurai was also likened to cherry blossom as his life, while glorious, was prone to a sudden end during military service, similar to petals shed by cherry blossoms or camellia. The National Cherry Festival is a festival in Traverse City, Michigan.  It began in 1925 as the Blessing of the Blossoms Festival, which was held in early May to attract tourists to Northern Michigan to view the blooming cherry blossoms.  In 1931 the Michigan Legislature renamed the festival to the National Cherry Festival, and moved the event to the summer.  Since 2004, a May event coinciding with blooming of the cherry blossoms is also held again, as the Blossom Days Festival, in addition to what is now the better-known National Cherry Festival. Ōmiya Park (大宮公園 , Ōmiya Kōen ) is a public park located 1 km northeast of Ōmiya Station and the most visited park in Saitama.  The park encompasses a huge area of 67.9ha (as of 2004) and is famous for Japanese Red Pine forest and cherry blossoms.  In particular, the park ranks in the Top 100 Locations in Japan for Cherry Blossoms.
Answer: 1892