This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Which of the following are Inhalational insulins? \nSelect and explain. \nA. Afrezza, B. Exubera, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Afrezza and Exubera are inhalational insulins which are not much used now a days because of pulmonary fibrosis. Ref; HH Sharma 3rd ed.', 'role': 'assistant'}]