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
[{'content': 'Secondary tumour may spread to the orbit by all of the following except: \nSelect and explain. \nA. Direct spread from the lids, B. Via blood stream, C. Via lymphatic channels, D. Directly from the cranial cavity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Via lymphatic channels', 'role': 'assistant'}]