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Explanation:

Statement 1 presents a premise and statement 2 presents a rare example.
Option 1 cannot be concluded as statement 2 is a rare occurrence. It does not invalidate statement 1.
The two statements cannot be termed contradictory as the data mentioned in statement 2 mentions that “Murali did not work as hard as his friends, but still secured the first rank.”. From this, it cannot be inferred that Murali did not work hard at all. Thus, statement 2 can be said to be in sync with the premise presented in statement 1. Eliminate option 2.
Likewise, it cannot be confirmed that Murali did in fact work hard. Thus, option 3 can be eliminated. Statement 2 although a rare occurrence cannot be termed as irrelevant, since it does pertain to what is discussed in statement 1. Eliminate option 4.
Option 5 can be affirmed as statement 1 will still hold valid even if statement 2 is valid, as statement 2 is a rare occurrence.
Hence, the correct answer is option 5.