Which of the following is not an example of inflation?

Firms adjust their prices upwards to normal capacity levels after discounting them during the recession to maintain market share.
The OPEC oil cartel announces that it will increase oil prices by 5 per cent per quarter over the next 5 years.
The price of imports rises because the exchange rate depreciates by 10 per cent.

Answer: The OPEC oil cartel announces that it will increase oil prices by 5 per cent per quarter over the next 5 years.

Please read Fiscal sustainability 101 - Part 3 for further material or post a comment if you want further explanation.