Teacher: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Context : Isaac Nicola Romero (1916 in Havana, Cuba -- 1997) was a prominent Cuban guitarist and one of the founders of the modern Cuban Guitar School.
Answer : Havana
Solution: What was Isaac Nicola's city of birth?
Reason: The answer to the generated question according to context is Havana which is correct

Now, solve this instance: Context : The Tsar Tank (Russian: -), also known as the Netopyr' () which stands for Pipistrellus (a genus of bat) or Lebedenko Tank ( ), was an unusual Russian armoured vehicle developed by Nikolai Lebedenko ( ), Nikolai Zhukovsky ( ), Boris Stechkin ( ), and Alexander Mikulin ( ) from 1914 onwards.
Answer : 1914
Student:
In what year did Tsar Tank enter service?