Out of the four organs listed, three are alike in some manner and one is different. Select the odd one.​​

Now, we check each options.

Option (a): Kidney – Part of the excretory system, responsible for filtering blood and producing urine.

Option (b): Liver – Part of the digestive system, responsible for detoxification and metabolism.

Option (c): Large Intestine – Part of the digestive system, responsible for absorbing water and forming stool.

Option (d): Stomach – Part of the digestive system, responsible for breaking down food.

So, the odd one is Kidney.

Thus, correct option is (a).