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
Most common skin manifestation seen after 2 days of radiation therapy is – 
Select and explain. 
A. Erythema, B. Atopy, C. Hyperpigmentation, D. Dermatitis
A: Erythema
Answer: A: Erythema 
Explanation: Erythema is the earliest manifestation followed by desquamation.