question: True about treatment of early breast carcinoma?
opa: Aromatase inhibitors are replacing tamoxifen in premenopausal women
opb: Post mastectomy radiation therapy is given when 4 or more lymph nodes are positive
opc: Tamoxifen is not useful in post-menopausal women
opd: In premenopausal women, multidrug chemotherapy is given in selected patients