In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Sentence: Cardiac muscle kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle. Question: What kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle?
cardiac muscle

Sentence: The soho spacecraft first started to operate in 1996. Question: What year did the soho spacecraft first started to operate?
1996

Sentence: Evaporation occurs when water on the surface changes to water vapor. Question: What occurs when water on the surface changes to water vapor?

evaporation