a sacred cow
something that is never criticized even if it sometimes deserves to be
The national park system is a sacred cow of the government and is never criticized by anyone.
Benefits of Yams
Yam is an important dietary element
Yam is an important dietary element for Nigerian and West African people. It contributes more than 200 calories per person per day for more than 150 million people in West Africa, and is an important source of income. Yam is an attractive crop in poor farms with limited resources. It is rich in starch, and can be prepared in many ways. It is available all year round, unlike other, unreliable, seasonal crops. These characteristics make yam a preferred food and a culturally important food security crop in some sub-Saharan African countries