instruction:
Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
question:
Context: English is an important global language, but that doesn't mean it's easy to learn. Many experts have tried to make English easier for students to learn--but they weren't always successful. In 1930, Professor CK Ogden of Cambridge University invented Basic English. It had only 850 words (and just eighteen verbs) and Ogden said most people could learn it in just thirty hours. The problem was that people who learned Basic English could write and say simple messages, but they couldn't understand the answers in "real" English! It was also impossible to explain a word if it wasn't in the Basic English word list. For example, if you wanted a watermelon, you asked for "a large green fruit with the form of an egg, which has a sweet red inside and a good taste"! RE Zachrisson, a university professor in Sweden, decided that the biggest problem for learners of English was spelling, so he invented a language called Anglic. Anglic was similar to English, but with much simpler spelling. "Father" became "faadher", "new" became "nue' and "years" became "yeerz". Unfortunately for some students of English, Anglic never became popular. Even easier is the language which ships' captains use: it's called "Seaspeak". Seaspeak uses a few simple phrases for every possible situation. In Seaspeak, for example, you don't say, "I'm sorry what did you say?" or "I didn't understand, can you repeat that?" It's just "Say again." No more grammar! In the age of international communication through the Internet who knows? ... a new form of English might appear. A large number of the world's e-mails are in English and include examples of "NetLingo" like OIC (Oh, I see) and TTYL (Talk to you later). In another fifty years, English might not exist ... we will probably all speak fluent Internetish! 
 Question: According to Professor Zachrisson, what was the biggest problem for learners of English?
answer:
spelling.


question:
Context: The All-Russia People's Front (Russian: ), known by its Russian initialism ONF, is a movement in Russia started in 2011 by then-Prime Minister of Russia Vladimir Putin to provide United Russia with ''new ideas, new suggestions and new faces''. 
 Question: Who led All-Russia People's Front?
answer:
vladimir putin


question:
Context: Direct oral anticoagulants (DOACs) offer noninferior efficacy and improved safety compared to vitamin K antagonists (VKAs) for the prevention and treatment of venous thromboembolism and for the prevention of stroke and systemic embolism in nonvalvular atrial fibrillation. Unlike VKAs, DOACs do not require routine laboratory monitoring of anticoagulant effect and dose adjustment. In certain situations, however, laboratory assessment of anticoagulant effect may be desirable. Here we review the utility of currently available assays for assessment of DOAC effect and recommend an optimal assessment strategy for each drug, including calibrated dilute thrombin time or ecarin-based assays for dabigatran and calibrated anti-Xa activity assays for the factor Xa inhibitors. We also discuss reversal strategies, both specific and nonspecific, for each drug, including the preferential use of idarucizumab for the reversal of dabigatran and two agents, andexanet and ciraparantag, currently under development for the reversal of rivaroxaban, apixaban, and edoxaban. 
 Question: Which drug can be reversed with idarucizumab?
answer:

dabigatran