Under what condition, if any, may a pilot allow a person who is obviously under the influence of drugs to be carried aboard an aircraft?
A.	Only if the person does not have access to the flight deck or pilot’s compartment.
B.	Under no condition.
C.	In an emergency or if the person is a medical patient under proper care.

Answer (B) is incorrect.
A pilot may allow a person who is obviously under the influence of drugs to be carried aboard an aircraft in an emergency or if the person is a medical patient under proper care.

Answer (C) is correct. (14 CFR 91.17) ( ? )
No pilot of a civil aircraft may allow a person who demonstrates by manner or physical indications that the individual is under the influence of drugs to be carried in that aircraft, except in an emergency or if the person is a medical patient under proper care.