In endochondral ossification, what is the original source of osteoblasts?
A) The hyaline chondrocytes become osteoblasts.
B) The differentiation of cells in the inner layer of the perichondrium.
C) The differentiation of cells in the endochondrium.
D) The differentiation of cells in the synovial cavity.
E) The fibroblasts become osteoblasts.
Answer: B
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