Pick out the word in the following question that is different....

Here in the question, we have to find the word which is the odd one out among the given four. As we all know faeces is the solid waste substance that people and animals get rid of from their body by passing it through the anus. Stool and faeces are same it is made of what is left after your digestive system absorbs nutrients and fluids from what you eat and drink. Excreta and faeces are the same words it also means human waste, but a foetus is an unborn animal or human being in its later stages of development. Hence, the foetus is the right answer.