This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
[{'content': 'Drug of choice for Her 2 Neu positive Breast cancer \nSelect and explain. \nA. Trastuzumabb., B. Tamoxifen, C. Exemestane, D. Fluvestart', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Trastuzumab(Ref. Bailey and Love 27th Edition Page 878)* Drug of choice for Tumors containing Growth Factor receptor positive for C- erb B2 is Trastuzumab (Herceptin)* Other agents currently available are:# Lapitinib- Oral Combined Tyrosine Kinase Inhibitor# Pertuzumab- Tyrosine Kinase inhibitor# T-DM1- A drug which has emestane is bound to Anti Her 2 agent to allow targeted delivery of Chemotherapy for HER-2 Positive cases.', 'role': 'assistant'}]