This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'During radiotherapy the Buccal Mucosa exhibits radiation reaction before skin due to - \nSelect and explain. \nA. Rapid cellular turn-over in bone, B. Slow cellular turn-over in blood vessel, C. Rapid cellular turn-over in skin, D. Rapid cellular turn-over in mucosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Rapidly dividing cells are generally more radio sensitive then slowly dividing cells, reflecting radiation induced inhibition of D.N.A. synthesis.', 'role': 'assistant'}]