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': 'In a patient with suspected tubercular anterior uveitis the diagnosis is confirmed by: \nSelect and explain. \nA. Positive Mantoux test, B. Associated findings suggestive of old systemic tuberculosis, C. A positive response to isoniazid test, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. A positive response to isoniazid test', 'role': 'assistant'}]