This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
A patient of pneumonia develops sputum expectoration. What is the stage of pneumonia- 
Select and explain. 
A. Congestion, B. Red hepatization, C. Grey hepatization, D. Resolution
D: Resolution
Answer: D: Resolution 
Explanation: Ans. is 'd' i.e., Resolution * "In stage of resolution, consolidation tissue re-aereates and the fluid infiltrate. Causes sputum"* "Symptoms of pneumonia include cough, initially short, painful and dry and later on expectoration (during resolution). -----Clinical medicine