In the 1840s, the introduction of the first three surgical anesthetics occurred. These agents were nitrous oxide, chloroform, and:
A. ester
B. ether
C. chlorophyll
D. ammonium dioxide
b
Rationale: In the 1840s, surgical anesthesia became possible with the introduction of three agents in quick succession: chloroform, ether, and nitrous oxide.
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