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
Example of type-I respiratory failure is: March 2010 
Select and explain. 
A. Cardiogenic shock, B. Atelectasis, C. Myasthenia gravis, D. ARDS
D: ARDS
Answer: D: ARDS 
Explanation: Ans. D: ARDS