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                              Q:
                           
                           
                                                      | A) filtering minerals from blood | B) fluids balance | 
| C) filtering wastes from blood | D) None of the above | 
                              Answer:   D) None of the above
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:

The three main functions of Kidneys are ::
* Regulating and filtering minerals from blood.
* Maintaining overall fluid balance.
* Filtering waste materials from food, medications, and toxic substances.
 
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