Which of the following is the odd one out?

The answer is A. Specific goods.

Specific goods are goods that are identified and agreed upon at the time of the contract. Un-ascertained goods are goods that are not identified at the time of the contract, but will be identified at a later date. Future goods are goods that will not be available until after the contract is formed. Ascertained goods are goods that have been identified and agreed upon at the time of the contract, and are available for delivery.

In this case, the question is asking which of the following is not a type of goods. Specific goods are a type of goods, so they are the odd one out.