question: Which of the following is/are true about pehes disease? 1. Avascular necrosis of femoral head2. Onset before 10 years of age3. Osteotomy is used for treatment4. Limb shoening
opa: 1,2 true & 3,4 false
opb: 2,3 True & 1,4 false
opc: 1,2,3 true & 4 false
opd: All are true