Answer the following question given this paragraph: 

There are two types of endoplasmic reticulum. They are called rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). Both types are shown in Figure below .


Q: What are the two types of endoplasmic reticulum?

 Choices:

- thick & smooth

- rough & thin

- rough & thick

- rough & smooth

A:
rough & smooth
