Your patient is a 22-year-old female that accidentally ate some shellfish and is now having a severe reaction. She tells you that the last time she ate shellfish, "they had to put a breathing tube in my throat and I almost died." Her face is starting to swell up and you can hear audible wheezing when she breathes. The chemical that produces edema and narrowing of the airways during

hypersensitivity reactions like this is called:

A) insulin. B) histamine. C) serotonin. D) acetylcholine.

B