All of the following statements about endosperm in angiosperms are correct EXCEPT:
A. It forms entirely from maternal tissue.
B. It has a triploid chromosome number.
C. It forms from a portion of the embryo sac that contains the polar nuclei.
D. It provides nutrients for the growing embryo.
E. It originates from a cell that is fertilized by a sperm nucleus from a pollen grain.
Answer: A. It forms entirely from maternal tissue.