The profession of the teacher / the profession of a teacher?

[englishhobby]

It's articles again.)
Which is correct?

 

[5jj]

The teaching profession.

Why don't you stick with the most natural?

 

[englishhobby]

Thank you, 5jj! And what about the phrase "the son of a teacher"? If we only know that a person's father is a teacher (by profession), are both variants below correct?
He is a teacher's son. He is the son of a teacher.

 

[Rover_KE]

Yes, they are correct.

Also 'His father is a teacher'.

Rover