Which one of the following is not a fertilizer?

Which one of the following is not a fertilizer? Correct Answer Calcium sulphate

Calcium sulfate is a common laboratory and industrial chemical. In the form of -anhydrite (the nearly anhydrous form), it is used as a desiccant. It is also used as a coagulant in products like tofu. The main sources of calcium sulfate are naturally occurring gypsum and anhydrite which occur at many locations worldwide as evaporites.

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Which of the following statements about fertilizer is true?
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