This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
[{'content': 'Which one of the following is not the characteristic feature of kwashiorkor? \nSelect and explain. \nA. Hair and skin changes, B. Muscle wasting, C. Growth retardation, D. Psychomotor changes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muscles of the upper limb are wasted, but the lower extremities appear swollen. Muscle wasting is masked by well-preserved subcutaneous tissue and edema. Ref: Page 105, Ghai essential pediatrics; 6th edition', 'role': 'assistant'}]