Which of the following statements is always true regarding prime numbers?

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A All the prime numbers are odd.
B Every even number is a composite number.
C 2 is the only even prime number.
D The sum of any two prime numbers is even.

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Answer: C. 2 is the only even prime number.

2 is the only even prime number, because every other even number is divisible by 2. Not all primes are odd (2), not every even number is composite (2), and 2 + 3 = 5 is odd.

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Which of the following statements is always true regarding prime numbers?

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