Which of the following is used by dentists as a substitute for anesthe – McqOptions

MCQOPTIONS

1.	Which of the following is used by dentists as a substitute for anesthetics?A. OxygenB. NitrogenC. Nitrous OxideD. Chlorine
A.	B
B.	C
C.	A
D.	D
Answer» C. A

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