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
Which of the following is most common metastatic tumour of orbit: March 2013 
Select and explain. 
A. Hodgkin's lymphoma, B. Chloroma, C. Malignant nasopharyngeal tumours, D. Breast carcinoma
C: Malignant nasopharyngeal tumours
Answer: C: Malignant nasopharyngeal tumours 
Explanation: Ans. C i.e. Malignant nasopharyngeal tumours