This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast Cancer - Treatments, Subject name: Surgery
[{'content': 'In a post menopausal woman with ER positive breast cancer most appropriate drug would be - \nSelect and explain. \nA. Aromatase inhibitor, B. Tamoxifen, C. Herceptin, D. Flutamide', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Aromatase inhibitor Adjuvant hormone therapy (tamoxifen) is added to all those with estrogen receptor positive.o The use of chemotherapy in post-menopausal women is controversial.# In post menopausal women, chemotherapy is frequently used upto age 70 yrs, if she can tolerate it.# In older women, chemotherapy is performed less frequently.o In estrogen positive tumors, in postmenopausal women, antiestrogen (aromatase inhibitors) therapy is the preferred form of adjuvant systemic treatment.", 'role': 'assistant'}]