When it comes to building a retirement corpus, there are many financial instruments worth considering, including the mandatory provident fund deductions. But none matches the returns that equity-related instruments such as mutual funds (MFs) and stocks can give. While this is true, there are more risks involved with equity-related investments. Stock selection without due research can have devastating results and hence it is advisable to take the safer route of MFs, where professional fund management helps you build the corpus at a nominal fee.