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
Which of the following are Inhalational insulins? 
Select and explain. 
A. Afrezza, B. Exubera, C. Both, D. None
C: Both
Answer: C: Both 
Explanation: Afrezza and Exubera are inhalational insulins which are not much used now a days because of pulmonary fibrosis. Ref; HH Sharma 3rd ed.