An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A', the pink colour disappears. The following statement is true for solution 'A' and 'B'.

The aqueous solution 'A' turns phenolphthalein solution pink, which means it is a strong base. The addition of an aqueous solution 'B' to 'A' makes the pink colour disappear, which means 'B' is an acid. Therefore, 'A' has pH greater than 7 and 'B' has pH less than 7.