Which of the following statement is incorrect regarding Magnesium?

The correct option is A Magnesium cannot form alloys with aluminium or zinc but it forms alloys with manganese and tin.
Uses of magnesium :
1. Magnesium forms alloys with aluminium, zinc, manganese and tin.
2. Mg-Al alloys being light in mass are used in air-craft construction.
3. Milk of magnesia is used as antacid in medicine.
4. Mg is used in flash powders and bulbs, incendiary bombs and signals.
5. $MgC{O}_3$ is used as an ingredient in toothpaste.