Substance produced by the micro organism and which can inhibit the growth of other micro-organisms is

Options

A. Antibiotic
B. Anti microbial
C. Disinfectants
D. Anti septic

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a substance produced by microorganisms that can inhibit the growth of other microorganisms.

2. **Identifying Key Terms**: The key terms here are "substance," "produced by microorganisms," and "inhibit the growth of other microorganisms."

3. **Defining the Substance**: The substance that fits this description is known as "antibiotics." Antibiotics are compounds that are produced by certain microorganisms, such as bacteria and fungi, and they have the ability to inhibit or kill other microorganisms, particularly bacteria.

4. **Historical Context**: The term "antibiotics" was first introduced by Selman Waksman in 1942. He was instrumental in the discovery and development of many antibiotics.

5. **Applications of Antibiotics**: Antibiotics are primarily used in medicine to treat bacterial infections in humans and animals. They work by either killing the bacteria or inhibiting their growth, thereby allowing the immune system to eliminate the infection.

6. **Related Terms**: It is also important to note related terms such as "antimicrobial," which refers to agents that kill microorganisms, and specific types of antibiotics like antifungal and antibacterial agents.

### Final Answer:
The substance produced by microorganisms that can inhibit the growth of other microorganisms is called **antibiotics**.

---