Roughage includes _______ food.

Reason: Roughage includes fibrous food. Roughage is the indigestible portion of foods. It has many functions in the animal body. For e.g. it adds bulk to the stool. It also speeds the passage of foods through the digestive system. Roughage does not provide any energy to the body. So, it is not nutritious. Therefore; option (A) is not the answer. Animal feed includes: (a) roughage which is largely fibre, and (b) concentrates which are low in fibre and contain relatively high levels of proteins and other nutrients.Therefore, (C) and (D) form the part of concentrates and not fibres.