In earlier insulin used for diabetes was extracted from pancreas of which animals ?

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the source of insulin used for diabetes treatment in earlier times.

2. **Identifying the Animal**: Historically, insulin was extracted from the pancreas of certain animals. The primary animal used for this purpose was the pig.

3. **Extraction Process**: The insulin was obtained from the pancreas of pigs after they were slaughtered. This process involved killing the pig to access its pancreas.

4. **Immune Response**: When insulin extracted from pigs was administered to humans with diabetes, there was often an immune response. The human body could reject the pig insulin because it recognized it as foreign.

5. **Transition to Recombinant Technology**: Due to the issues with immune rejection, the medical field transitioned to using recombinant DNA technology to produce human insulin, which is now the standard treatment.

6. **Final Answer**: Therefore, the correct answer to the question is that earlier insulin used for diabetes was extracted from the pancreas of pigs.

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