Which of the following statements about the olfactory system is true?

Question

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[II F 1 a, b]. Cranial nerve (CN) I innervates the olfactory epithelium. Its axons are $\mathrm{C}$ fibers. Fracture of the cribriform plate can tear the delicate olfactory nerves and thereby eliminate the sense of smell (anosmia); however, the ability to detect ammonia is left intact. Olfactory receptor cells are unique in that they are true neurons that are continuously replaced from undifferentiated stem cells.

Which of the Following Statements About the Olfactory System Is