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 glaucoma in early stage of herpes zoster ephthalmicus occurs due to: \nSelect and explain. \nA. Trabeculitis, B. Iridocyclitis, C. Haemorrhagic hypopyon, D. Hypersecretion of aqueous humour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Trabeculitis', 'role': 'assistant'}]