This question is followed by four possible answers. The alternatives other than the correct answer also seem to have a relationship with the item mentioned in the statement. You are required to select the absolute truth which always holds or verifies the truth of the statement: "A Pen always has_______________

Nib

A Pen always has nib.

Cap, ink, tube can be replaced/refilled in the pen. We cannot write with the pen if there is no nib.