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: sellapan ramanathan (tamil: செல்லப்பன் ராமநாதன்; (july 3, 1924 – august 22, 2016) was the sixth president of the republic of singapore.

A: sellapan ramanathan
****
Q: the river clyde (, ]) is a river in scotland.

A: river clyde
****
Q: dumb and dumber is a 1994 american comedy road movie.

A:
dumb and dumber
****