This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
A 8 year old boy presented with swelling in the left eye of 3 months, examination revealed proptosis of left eye with preserved vision. Right eye is normal. CT scan revealed intraorbital extraconal mass lesion. Biopsy revealed embryonal rhabdomyosarcoma. Metastatic work up was normal. The standard line of treatment is - 
Select and explain. 
A. Chemotherapy only, B. Wide local excision, C. Enucleation, D. Chemotherapy and Radiaton therapy
D: Chemotherapy and Radiaton therapy
Answer: D: Chemotherapy and Radiaton therapy 
Explanation: Treatment of choice for rhabdomyosarcoma is Radiotherapy followed by chemotherapy.