instruction:
Classify the relation of question with context to one of these categories: 1) award received, 2) based on, collection, 3) conflict, 4) constellation, 5) convicted of, 6) date of death, 7) director, 8) drafted by, 9) educated at, 10) medical condition, 11) military branch, 12) narrative location, 13) occupation, 14) original network, 15) parent company, 16) point in time, 17) production company, 18) residence, 19) series, 20) service entry, 21) sex or gender, 22) spouse, 23) standards body question.
question:
Context : For decades only Episode 3 of The Enemy of the World was known to have survived erasure, but the five missing episodes were announced as recovered by the BBC on 11 October 2013 along with four of the missing episodes of the following serial, The Web of Fear. 
Question : To which series does The Enemy of the World belong?
answer:
series


question:
Context : Klaus Nöske (26 November 1911 -- 15 May 1978) was a highly decorated Major in the Luftwaffe during World War II and an Oberstleutnant in the Bundeswehr. 
Question : What war did Klaus Nöske fight in?
answer:
conflict


question:
Context : The Panzer II was designed before the experience of the Spanish Civil War of 1936--39 showed that shell-proof armor was required for tanks to survive on a modern battlefield. 
Question : What year was Panzer II introduced?
answer:

service entry