All are true statements regarding Metaplasia except:

A Metaplasia is an irreversible change in which one differentiated cell type (epithelial or mesenchymal) is replaced by another cell type.
B The most common epithelial metaplasia is columnar to squamous, as occurs in the respiratory tract in response to chronic irritation.
C A deficiency of vitamin A (retinoic aci
D induces squamous metaplasia in the respiratory epithelium. d) The influences that predispose to metaplasia, if persistent, can initiate malignant transformation in metaplastic epithelium.

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