Toxicological Trivia from May 27, 2016: we mentioned in our previous trivia (333) the Camoati (Polybia scutellaris) as biological control of basket bug. In a bulletin we mentioned that "Wasps: a revealing thesis" was a research conducted at the University of Buenos Aires that could provide an explanation for a curious fact of nature. Why the bite of a South American Camoati -does not cause allergy, while a pang of most other species of wasps produce effects that can range from bruises to death. That bulletin was:a) Two year ago;b) 6 years ago;c) 12 years ago.