The correct answer is 8 lakh.

Let us work through this problem carefully, step by step, using the data from both tables.

Step 1: Find the Total Number of Patients in the World (2023)

Total world population = 800 crore
Patients = 10% of 800 crore

$\text{Total Patients}=\frac{10}{100}\times 800\text{crore}=80\text{crore}$

Step 2: Find the Number of Patients in Europe in 2023

From Table II, Europe accounts for 10% of all patients.

$\text{Europe Patients (2023)}=\frac{10}{100}\times 80\text{crore}=8\text{crore}$

Step 3: Find the Number of Patients in Europe After Two Years

The number of patients in Europe increases by 10% every year. This means each year the count is multiplied by 1.1.

After Year 1:

$8\times 1.1=8.8\text{crore}$

After Year 2:

$8.8\times 1.1=9.68\text{crore}$

Step 4: Find the Total Number of Kidney Patients in the World (2023)

From Table I, Kidney Disease accounts for 30% of all patients worldwide.

$\text{Total Kidney Patients}=\frac{30}{100}\times 80\text{crore}=24\text{crore}$

Step 5: Find the Number of Kidney Patients in South America (2023)

From Table II, South America accounts for 40% of Kidney patients.

$\text{Kidney Patients in South America}=\frac{40}{100}��24\text{crore}=9.6\text{crore}$

Step 6: Calculate the Difference

$\text{Difference}=9.68\text{crore}-9.6\text{crore}=0.08\text{crore}$

Converting to lakh:

$0.08\text{crore}=0.08\times 100\text{lakh}=8\text{lakh}$

Therefore, the difference between the number of patients in Europe after two years and the number of Kidney patients in South America in 2023 is 8 lakh.