'कलम से लिखो' — 'से' किस कारक का चिह्न है?

उत्तर: (B) करण — 'Se' here is Karan karak (instrumental) — the pen is the instrument of writing. 'Se' also marks Apadan karak (ablative/separation): 'Ped se patta gira' = the leaf fell FROM the tree. Distinguish by me...