What is manganese used for?

Correct answer: (d) More than one of the above

Explanation

Manganese has many uses:

• steel-making (ferromanganese), its main use
• dry batteries, as manganese dioxide
• matches, where its compounds help the head burn
• photography and chemical industries, and as potassium permanganate, a disinfectant

Since it is used in all three industries named, the answer is "More than one of the above".