How many months have 28 days?
All of them! But February is the only month to end on the 28th day (except for leap years every four years, when it ends on the 29th day).
Instruction: How many months have 28 days?
Context: 
Response: All of them! But February is the only month to end on the 28th day (except for leap years every four years, when it ends on the 29th day).