How to return an instance of a class from the database?

Question

Python

I don't quite understand the moment. How does an ORM query turn into a class:

class User(Base):
  __tablename__ = 'users'
  id = Column(Integer, primary_key=True)
  name = Column(String)
  adr = relationship('Address', backref='uuu')

class Address(Base):
  __tablename__ = 'addresses'
  id = Column(Integer, primary_key=True)
  email = Column(String, nullable=False)
  # user_id = Column(Integer)
  user_id = Column(Integer, ForeignKey('users.id'))

Base.metadata.create_all(engine)
answer = sess.query(User.id, User.name).first() # вот этот момент

What do we return in answer here? ResultSet or class?
What happens if we write like this:

answer = sess.query(User.id, Address).first() # тогда что вернется?

When is the class returned?