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: Radiology
The skin of a patient undergoing radiotherapy will show
after 2 weeks? 
Select and explain. 
A. Erythema, B. Depigmentation, C. Radiation induced carcinomas, D. No change
A: Erythema
Answer: A: Erythema 
Explanation: None