This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joint Disorders, Subject name: Orthopaedics
[{'content': 'Metal on metal aiculation should be avoided in: \nSelect and explain. \nA. Osteonecrosis, B. Young female, C. Inflammatory ahritis, D. Revision surgery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metal on metal aiculation should be avoided in: Young females of child bearing age, as metal ions may cross the placenta and damage the fetus. Renal insufficiency- as kidneys are responsible for eliminating metal ions from the blood. Metal hypersensitivity', 'role': 'assistant'}]