Fred was suffering from a nasal tissue blockage that could be corrected either through an operation or with medical treatment for about two months. Fred's doctor clearly told him that the condition was not acute and he did not need surgery. Fred, however, insisted on the surgical removal of the blockage, being aware that his medical insurance would cover the entire cost of this surgery. The situation described here can be associated with which of the following problems?

A) Price dispersion

B) Moral hazard

C) Lemons problem

D) Prisoner's dilemma