<human>:  What is the safest form of investment for retirement?
<bot>: The safest form of investment for retirement is typically one that is low-risk, such as a portfolio made up of a combination of stocks, bonds, and cash. Be sure to diversify your investments and consider the long-term security of each investment option. It's also important to consider taxes, inflation, and other factors however, as these can greatly reduce the earning potential of any retirement plan.