Gray hepatization of lungs is seen on the day -: (A) 1, (B) 3-Feb, (C) 5-Mar, (D) 7-May
Answer is D. All 4 phases may be seen in different parts of the same lung

Congestion (1-2 days)
Red hepatization (2nd-4th day)
Gray hepatization (5th-8th day)
Resolution (8th-9th day)