Which of the Following Makes Pibloktoq, a Condition Found Among

Which of the following makes pibloktoq, a condition found among Arctic populations, a 'culture-bound syndrome'?

A) There is no change to the body during the disease, which is therefore purely cultural.
B) It is not: it is really just a vitamin deficiency.
C) Its manifestation (expression, symptoms) is shaped by cultural knowledge.
D) The disease is endemic to the population because of an altered night-day schedule during the winter.
E) No answer given is correct.