Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

[Q]: the english cocker spaniel is a breed of dog.
[A]: english cocker spaniel


[Q]: lee bowyer (born 3 january 1977) is an english football player.
[A]: lee bowyer


[Q]: heat capacity is a measure of how much materials can store up heat as they change temperature.
[A]:
heat capacity