Explanation:

Let's take a look at the options regarding the merger of the State Bank of India with its associate banks.

- Option 1: Rs. 37 lakh crores

This is not the correct value for the total assets after the merger.

- Option 2: Rs. 72 lakh crores

This could seem like an overestimate for the merger's total assets.

- Option 3: Rs. 60 lakh crores

This also doesn't match any widely reported estimates around the time of the merger.

- Option 4: Rs. 48 lakh crores

This is the most accurate estimate for the total assets after the merger of SBI with its associate banks.

- Option 5: Rs. 15 lakh crores

This is significantly lower than the estimated worth after such a major merger.