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
Pneumocystis carini pneumonia is diagnosed by 
Select and explain. 
A. Interstitial penumonia, B. Eosinophils in septa, C. Alveolar type I cell damaged with eosinophils, D. All of the above
A: Interstitial penumonia
Answer: A: Interstitial penumonia 
Explanation: None