Group 1 - The term "underlying asset" refers to the basis of options trading, specifically in the context of 50ETF options, where the underlying asset is the 50ETF fund that tracks the SSE 50 Index, composed of the 50 largest stocks on the Shanghai Stock Exchange [1] - Each 50ETF options contract has a strike price and an expiration date, with the strike price being the predetermined price at which the underlying asset can be bought or sold, and the expiration date being the day the option can be exercised [2] - As a buyer of an options contract, there are two choices: to sell the contract for profit if the price has appreciated, or to exercise the option on the expiration date to buy or sell the specified quantity of the 50ETF fund [3] Group 2 - The price of 50ETF options contracts fluctuates significantly with the price movements of the underlying asset, the 50ETF, due to the inherent leverage in each options contract, which can amplify price changes [5] - Many investors engage in trading 50ETF options contracts, which are influenced by the price volatility of the underlying asset, leading to potential profits or losses depending on the direction of the market [5]