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
A 45 year old female with history of painless breast lump measuring 6.2x4.5 cm. Trucut biopsy showed carcinoma breast. She underwent surgical removal of and post operative biopsy showed with carcinoma breast with high grade necrosis with margin 4 mm. Which of the following is needed? 
Select and explain. 
A. Adjuvant chemotherapy, B. Adjuvant radiotherapy, C. Adjuvant chemoradiotherapy, D. No additional treatment
C: Adjuvant chemoradiotherapy
Answer: C: Adjuvant chemoradiotherapy 
Explanation: Ans. (c) Adjuvant Chemo RT(Ref Page 854/Sabiston 20th Edition)* Indications of RT:# Extracapsular nodal extension# Lymphovascular invasion# Close surgical margins# High grade necrosis# Age < 40 years