Humulin is

Options

A. an antibiotic
B. a digestive enzyme in humans
C. human insulin produced in bacteria
D. bacterial insulin produced in humans

Explanation

**Step-by-Step Solution:**

1. **Understanding Humulin**: Humulin is a brand name for human insulin that is produced using recombinant DNA technology. It is a form of insulin that is identical to the insulin produced by the human pancreas.

2. **Production of Humulin**: The production of Humulin involves inserting the human insulin gene into bacterial plasmids. This process is a part of genetic engineering, where scientists manipulate the genetic material of organisms.

3. **Use of Bacteria**: The bacteria, typically *Escherichia coli* (E. coli), are transformed with the plasmid containing the human insulin gene. These bacteria then use the inserted gene to produce insulin.

4. **Harvesting Insulin**: After the bacteria have multiplied and produced insulin, the insulin is harvested and purified for medical use. This process allows for the mass production of insulin, which is crucial for people with diabetes.

5. **Importance of Humulin**: Humulin is significant because it provides a reliable source of insulin for diabetic patients, reducing the risk of complications associated with diabetes. It is a prime example of how biotechnology can be used to produce essential medications.