I think his answer is correct.

Naomasa is my best friend.

It is important for each person to fulfill their role.

This food may contain carcinogens.

We exist as a part of the material world.

Antibiotics don't work for colds, so please don't take them unnecessarily.

It is said that antimatter has properties opposite to those of matter.

The existence of dark matter has not yet been fully proven.

The air in this area is greatly affected by pollutants emitted from factories.

He was sentenced to death by electric chair.