Acting on an anonymous phone call, the police raid a house to arrest a suspected murderer. They don’t know what he looks like but they know his name is John and that he is inside the house. The police bust in on a carpenter, a lorry driver, a mechanic and a fireman playing cards. Without hesitation or communication of any kind, they immediately arrest the fireman. How do they know they’ve got their man?

The fireman is the only man in the house while the rest of the card players are women.

Explanation:

the police raid a house to arrest a suspected murderer. They don’t know what he looks like but they know his name is JOHN and that he is inside the house

The police bust in on a carpenter, a lorry driver, a mechanic and a fireman playing cards. Without hesitation or communication of any kind, they immediately arrest the fireman.

The police were able to get their because the fireman was the only man inside the house while the other people playing cards are women

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )