If there are truly wise people in this world, in which line of work would they most likely be?

The problem with such a question is that there is no agreed definition of the word wise.

So a religious person might choose Religion and a worldly person might choose Government while a person who personally feels no great need to own things might choose Philanthropy. However I suspect that the wisdom that the religious person has in mind is not the same thing as the wisdom that the Government person has in mind and while the religious might think they have a lot in common with the philanthropist the philanthropist might disagree.

Etc.