Caste

Marriage formed basis of Caste

Kunti broke this to unite with sun to produce karna from ear

http://k00y.blogspot.com/search/label/VirginBorn

in the similar way as earth originated

http://harekrishnainfo.blogspot.com/search/label/EarthofEar

Karna then choose Parashurma who born as brahmin did the work of kshatriya as his Master

Later questioned by duryodana to suggest replacement of commander bhishma

He suggested drona who born as brahmin did the work of kshatriya as his commander