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.

[EX Q]: malva is a genus of about 25-30 species of plants commonly called mallows.
[EX A]: malva

[EX Q]: the gandaki river is one of the major rivers of nepal.
[EX A]: gandaki river

[EX Q]: thaddeus bullard (born april 29, 1977 in boynton beach, florida) better known under the ring name titus o'neil, is an american professional wrestler and former american football player currently signed to world wrestling entertainment (wwe).
[EX A]:
titus o'neil