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': 'Investigations in a clinically suspected case of tuberculosis - \nSelect and explain. \nA. Mantoux (in children), B. Sputum AFB, C. Bactec, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]