Which Statement About the Thyroid Gland Is True

Which statement about the thyroid gland is true?

A) The first step in producing thyroxine is production of thyroglobulin, a large protein made from tryptophan residues.
B) Thyroglobulin is iodinated and later cleaved by lysosomal enzymes into smaller molecules.
C) Epithelial cells that make up follicles in the thyroid gland produce calcitonin.
D) Triiodothyronine (T₃) contains three tyrosine residues, and tetraiodothyronine (T₄) contains four tyrosine residues.
E) Cells near the follicles of the thyroid gland produce calcitriol.