_ The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to$?

_ The cast iron when heated to red heat with powdered red haematite in

1.	_ The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to$?
A.	Grey cast iron
B.	White cast iron
C.	Mottled cast iron
D.	Toughed cast iron
Answer» D. Toughed cast iron