In these questions, the relationship between different elements is shown in the statements. The statements are followed by two conclusions. Answer the questions given below.

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The correct answer is If only conclusion II is true.

Step 1: Analyze the given statements
We are given two statement sets showing relationships between elements:
1. $U>B=G\ge S\ge L$
2. $X<B\le K<J$

Step 2: Evaluate Conclusion I
Conclusion I asks us to check the relationship between $U$ and $J$:
From statement 1, we have: $U>B$
From statement 2, we have: $B\le K<J$
Combining these gives the path: $U>B\le K<J$
Since opposite inequality signs ($>$ and $\le$) are present between $U$ and $J$, no definite relation can be established between $U$ and $J$.
Therefore, Conclusion I is false.

Step 3: Evaluate Conclusion II
Conclusion II asks us to check the relationship between $K$ and $L$:
From statement 2, we have: $K\ge B$
From statement 1, we have: $B=G\ge S\ge L$
Combining these along the path from $K$ to $L$:
$K\ge B=G\ge S\ge L$
All symbols from $K$ to $L$ are pointing in the same direction ($\ge$ and $=$), which confirms that $K\ge L$ is definitely true.
Therefore, Conclusion II is true.

Conclusion:
Since only conclusion II is true, the correct choice is If only conclusion II is true.