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: Medicine
[{'content': 'Which is the most common organ involved in sarcoidosis \nSelect and explain. \nA. Lung, B. Liver, C. CNS, D. Eye', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Lung", 'role': 'assistant'}]