1. stock option: an option contract with a certain stock as the underlying asset. Stock options allow option holders to buy (call options) or sell (put options) a certain number of stocks at a predetermined price at some future time.

2. Index option: an option contract based on the stock index. The exercise of index options is based on a specific stock index level, not a specific stock.

3. Foreign exchange option: an option contract based on foreign exchange assets. Foreign exchange options allow option holders to buy (call options) or sell (put options) a certain amount of foreign exchange at a certain exchange rate at some future time.

4. commodity options: Option contracts with specific commodities (such as gold and crude oil) as the underlying assets. Commodity options allows option holders to buy (call options) or sell (put options) a certain number of commodities at a certain price at a certain time in the future.

5. Interest rate option: an option contract for assets based on interest rate. Interest rate options allow option holders to borrow or invest at a certain interest rate in the future.

6. Stock index options: similar to index options, but usually more focused on a specific stock index than the index of the whole market.

These option types provide different investment opportunities and risks, and investors can choose appropriate option contracts according to their investment objectives and risk preferences.