Read the given passage and answer the question.
Sukriti and Priya are good friends and study in I standard of a reputed school. On a hot summer day, while they both were playing in the school playground, Priya felt uncomfortable and sat down. After some time she developed acute headache and high fever. Her legs stopped moving and she also felt some stiffness in her neck. Soon she became unconscious.
What could be the probable reason for Sukriti not being affected by pathogen of this disease?

Options

A. Sukriti's immune system has already encountered the weakened pathogens and developed memory cells, which produce antibodies whenever pathogen enters her body.
B. Sukriti had actually contracted the disease few months back and recovered, hence her immune system has developed memory cells, which prevent any subsequent pathogen attack.
C. Sukriti is taking antibiotics regularly, which kill the pathogens entering her body and prevent the actual disease.
D. Sukriti has received antibodies against the pathogen from her mother via placenta so she is immune to the pathogen of this disease by birth.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Scenario**: Sukriti and Priya are playing together on a hot summer day. Priya starts feeling unwell and eventually becomes unconscious due to symptoms like headache, fever, and stiffness in her neck.

2. **Identifying the Disease**: Based on the symptoms described (acute headache, high fever, stiffness in the neck), it is likely that Priya is suffering from a viral infection, possibly polio, which is caused by the polio virus.

3. **Analyzing Sukriti's Condition**: The question asks why Sukriti is not affected by the same pathogen that has caused Priya's illness.

4. **Considering Immune Response**: One possible reason for Sukriti's immunity could be that she has previously been vaccinated against polio. Vaccination helps the immune system to recognize and fight off pathogens by introducing a weakened or inactive form of the virus.

5. **Conclusion**: Therefore, the probable reason for Sukriti not being affected by the pathogen of this disease is that she has received the polio vaccine, which has allowed her immune system to develop memory cells that can produce antibodies if the virus enters her body.

**Final Answer**: Sukriti is not affected by the pathogen of the disease because she has received the polio vaccine, which has prepared her immune system to fight off the virus.

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