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: Skin
Most common side effects of retinoids is 
Select and explain. 
A. Headache, B. Skin rashes, C. Photosensitivity, D. Diarrhoea
B: Skin rashes
Answer: B: Skin rashes 
Explanation: B i.e. Skin Rash