In Siegel Et Al

Multiple Choice

In Siegel et al.'s study of heroin tolerance in rats, which group experienced the LOWEST mortality rate when given a large dose of heroin?

A) the group that had not previously been exposed to heroin
B) the group that received the large dose in the same environment as the group that had received smaller doses
C) the group that received the large dose in a different environment from where the group had received smaller doses
D) All groups had about the same mortality rate.