Step 1: Understanding diabetes.
Diabetes is a disease that is directly related to the pancreas, which is responsible for producing insulin. Insulin regulates blood sugar levels in the body, and any dysfunction in the pancreas leads to diabetes.
Step 2: Explanation of the options.
• (A) Heart: Incorrect. The heart is not directly involved in the regulation of blood sugar in diabetes.
• (B) Kidney: Incorrect. Although kidneys can be affected by diabetes, they are not the organ directly responsible for diabetes.
• (C) Pancreas: Correct. The pancreas is the organ responsible for producing insulin, which is essential in controlling blood sugar levels.
• (D) Brain: Incorrect. The brain is involved in regulating certain bodily functions but is not the organ responsible for diabetes.
Step 3: Conclusion.
Therefore, the correct answer is (C) Pancreas.
Final Answer: Pancreas.