This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
8 year old boy presented with swelling in the left eye of three months duration examination revealed proptosis of the left eye with preserved vision right eye is normal CT Scan revealed incredible extraconal mass lesion biopsy revealed embryonal rhabdomyosarcoma metastatic workup was normal the standard line of treatment is 
Select and explain. 
A. Chemotherapy only, B. Wide local excision, C. Enucleation, D. Chemotherapy and Radiation therapy
D: Chemotherapy and Radiation therapy
Answer: D: Chemotherapy and Radiation therapy 
Explanation: Rhabdomyosarcoma is very responsive to radiotherapy Refer khurana 6/e p 425