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': 'The most common site of bleeding in Hemoptysis is \nSelect and explain. \nA. Tracheobronchial tree, B. Pulmonary Parenchyma, C. Pleural Disease, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Tracheobronchial tree): The most common source of hemoptysis is the tracheobronchial tree. The most common site of hemoptysis within the tracheobronchial tree are small to medium sized airways. The most common site of bleeding is the tracheobronchial treeQ The most common site of hemoptysis is bleeding from the small to medium sized airways Q', 'role': 'assistant'}]