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.

tuff (from italian "tufo") is a type of rock produced by the eruption of volcanoes.
tuff

the jungle book is a collection of stories written by rudyard kipling.
the jungle book

carl-henning pedersen (23 september 1913 20 february 2007) was a danish painter and a key member of the cobra movement which existed from 1948 to 1951.
carl-henning pedersen