Liver is the main storage of vitamin A in living animals. Having been the storage part of vitamin A in animals,eating directly of such part also enriches the end user with same amount of Vitamin A this alone is so rich and in the required limit.
Onion is more rich in vitamin C,and with a little of vitamin A.
A glass of wine have little amount of Vitamin A.
In all it would be seen that the liver provides the highest portio of Vitamin A.
Among the various options given, liver and eggs give the greater portion of Vitamin A than the other two options. Eggs are overall considered a very good diet because it a great source of protein. However, when you simply compare for Vitamin A, then liver gives slightly more percentage than eggs. The major reason is that many animals store vitamin A in the liver, hence it is richest source
