B1
used to give more information about someone
Dictionary examples:
My teacher, who can't use computers, teaches computer science. (0.0)
My grandma, who hates technology, just became a social media influencer. (0.0)
My roommate, who sleeps all day, got a job as a night guard. (0.0)
My brother, who's 17, has passed his driving test. (51.7)