44 According to the passage, what are some of the significant new findings about smell?
(A) Olfactory epithelium is a sort of receptor sheet located in the nose.
(B) From an evolutionary point of view, the nose is not considered very important.
(C) Scents can keep people more attentive and improve performance of a routine task.
(D) Limbic system of the brain plays a key role in regulating body functions and emotions.