The correct answer is C. Initiation of doxycycline. 

The presenting patient has findings most consistent with nodulocystic acne. In a patient with cystic fibrosis, this may be due to their medication. Regular acne treatments should prevail, including a trial of doxycycline in this case.

Cessation of the cystic fibrosis medication would be harmful to the patient, so this is not appropriate, though the medication may be the cause of acne. Dietary modification, triamcinolone injection, and oral dapsone are not appropriate for the management of acne.

References: Hudson BN, Jacobs HR, Philbrick A, et al. Drug-induced acne with elexacaftor/tezacaftor/ivacaftor in people with cystic fibrosis. J Cyst Fibros. 2022;21(6):1066-1069. doi:10.1016/j.jcf.2022.09.002

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