5 and 12 are co-prime numbers.

The correct option is A

True

Co-prime numbers are numbers which have only 1 as their common factor or their highest common factor is 1.

The factors of 5 are: 1, 5

The factors of 12 are: 1, 2, 3, 4, 6, 12

1 is the only common factor of 5 and 12.

Hence, 5 and 12 are co-prime numbers.