Identify the element, compound and mixture in the following picture

An element is a pure component, which can be distinguished into basic substances by physical or chemical means. In the given picture b is an element.  

Compound refers to a pure component formed of two or more elements, which are chemically bonded or combined. In the given picture c is a compound.  

Mixture refers to two or more components, which are mixed together but are not combined chemically. In the given picture, a is a mixture.  

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answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;