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
[{'content': 'Most common side effects of retinoids is \nSelect and explain. \nA. Headache, B. Skin rashes, C. Photosensitivity, D. Diarrhoea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Skin Rash', 'role': 'assistant'}]