Pathogenic microorganisms present in host cells are killed by ...... medicines.

Options

A. antibiotics
B. antibodies
C. pain killer
D. vaccines

Explanation

To solve the question "Pathogenic microorganisms present in host cells are killed by ...... medicines," we can follow these steps:

### Step 1: Understand the Question
The question is asking about the type of medicine that can kill pathogenic microorganisms that are already present inside host cells.

### Step 2: Identify the Options
We have four options to consider:
1. Antibiotics
2. Antibodies
3. Painkillers
4. Vaccines

### Step 3: Analyze Each Option
- **Antibiotics**: These are substances that can kill or inhibit the growth of bacteria. They are effective against pathogenic microorganisms and can act on those present in host cells.

- **Antibodies**: These are proteins produced by the immune system in response to antigens. They help in recognizing and neutralizing pathogens but do not kill them directly.

- **Painkillers**: These are medications that relieve pain but do not have any effect on microorganisms.

- **Vaccines**: These are used to stimulate the immune system to produce antibodies before an infection occurs. They do not kill pathogens that are already present.

### Step 4: Determine the Correct Answer
Given the analysis:
- Antibiotics are the only option that directly kills or inhibits the growth of pathogenic microorganisms present in host cells.

### Final Answer
Pathogenic microorganisms present in host cells are killed by **antibiotics**.

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