Answer the following question given this paragraph: 

Several other kinds of unsaturated monomers can be polymerized and are components in common household products. Polypropylene is stiffer than polyethylene is in plastic utensils and some other types of containers.


Q: What is the option to remove kidney stones other than surgery?

 Choices:

- pump treatments

- skin treatments

- glandular treatments

- ultrasound treatments

A:
ultrasound treatments
