The American architect Phillip Johnson frequently describes the profession of architecture as the second oldest profession. What is the first?

Prostitution

Explanation:

According to a different source, the options that come with this question are:

Prostitution is often known as the "world's oldest profession." This is because this profession addresses a need that has always been present in humans and that is considered absolutely essential to our existence. Moreover, the practice requires little specialization or technological development, and is of interest all over the world. However, besides this, architecture could possibly be one of the world's oldest professions as well.