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: a video projector takes a video signal and projects the corresponding image on a screen using a lens system.

A: video projector
****
Q: panampatta is a village situated near pathanapuram in kollam district, kerala state, india.

A: panampatta
****
Q: mario casalinuovo (18 may 1922 – 14 july 2018) was an italian politician.

A:
mario casalinuovo
****