Which was not a result of th 1898 discovery of the four blood types?

1. Improved blood transfusion safety

2. Effective blood preservation solutions developed

3. Elements of blood separated via centrifuge

4. All blood types made compatible with each other

The correct answer is option D. all blood types are compatible with each other.

Explanation:

In 1898, There was discovery regarding incompatibilities occurs during blood transfusion which is taking place due to the differences in the red blood cells of different people. On the basis of the differences present on the red blood cells, the blood groups are divided into four blood groups A, B, AB, and O blood groups.

It is discovered during world war first as the wounded and injured soldiers needed a blood transfusion, for these studies began to store and transport blood and during this study, four blood groups are found.

Thus, the correct answer is option D.