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: Unknown
[{'content': 'A most characteristic feature of atopic dermatitis is - \nSelect and explain. \nA. Extreme pruritus, B. Denny Morgan folds, C. Lichenification, D. Rash', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Extreme pruritus "Itching is severe and primary in atopic eczema, provoking a severe urge to scratch; atopic eczema is one of the most itchy disorders. It is an itch that rashes not just a rash that itches". -Venkatram', 'role': 'assistant'}]