Read the passage and then answer the question.

Your nose plays an important role in keeping you safe. If food is fragrant, then it is probably good to eat. If food smells bad, however, then it might be spoilt. Bad odours can come from moulds and bacteria growing on the food. Many moulds and bacteria can make you sick if you eat them. However, not all moulds and bacteria give off odours. So make sure you don’t eat food if you don’t know that it’s safe. When in doubt, throw it out!