Answer the following question given this paragraph: 

Microtubules guide the formation of the plant cell wall. Cellulose is laid down by enzymes to form the primary cell wall. Some plants also have a secondary cell wall. The secondary wall contains a lignin, a secondary cell component in plant cells that have completed cell growth/expansion.


Q: The secondary wall contains _________ , a secondary cell component in plant cells that have completed cell growth/expansion.

 Choices:

- cytoplasm

- glucogen

- cellulose

- lignin

A:
lignin
