<prompt> Which of the following layer of epithelium of oral mucous membrane is most sensitive to radiation?Stratum spinosumStratum granulosumStratum basaleStratum corneum  <response>: The oral mucosa contains a basal layer composed of rapidly dividing, radiosensitive progenitor cells.Key Concept:Rapidly dividing cells are more susceptible to radiation therapy.White and Pharoahs Oral Radiology Principles and Interpretation 8th edition 