62.
A:
At junction, introns have GU at 5’ end and AG at 3’end
B:
At junction, exons have UG at 5’ end and AG at 3’end
C:
At junction, introns have AG at 5’ end and UG at 3’end
D:
At junction, exons have GU at 5’ end and AG at 3’end
The answer is: A