Regarding list In many cases there is a incorrect solution in challenges

Question

lista=[1,23,4,5,6 ]
listb=lista
lista[0]=3
then listb[0]

Answer 1

The answer is 3, isn't it ?
And by the way, @Ace is right but you can ask the community to be sure if the answer is really wrong or not

Answer 2

Have you checked the code in playground/ shell before claiming that it is incorrect?