The question asks about the food source that is not good for nutritional calcium. The correct answer provided is Ragi (option 2) but that`s incorrect.

Alert - The correct answer should be Rice (Option 1).

Here is a brief explanation of each option:

Option 1: Rice is not rich in calcium compared to the other options given here. It provides other vital nutrients but falls short in the calcium department.

Option 2: Ragi, also known as finger millet, is packed with calcium. It is one of the few natural sources of this nutrient, hence it`s a good source of dietary calcium.

Option 3: Skimmed milk is well-known for its calcium content. It is one of the primary sources of calcium, which makes it a good source.

Option 4: Eggs do contain calcium, although the quantity is not as high as in skimmed milk or ragi, they still contribute to the daily calcium intake.

Hope this clarifies the concept.