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
Metal on metal aiculation should be avoided in: 
Select and explain. 
A. Osteonecrosis, B. Young female, C. Inflammatory ahritis, D. Revision surgery
B: Young female
Answer: B: Young female 
Explanation: 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