Answer: D

Reasoning: Leukemic gingivitis occurs in patients with acute leukemia who are often thrombocytopenic and prone to spontaneous gingival bleeding; invasive procedures such as scaling and polishing markedly increase the risk of uncontrollable hemorrhage and are therefore deferred until the leukemia is in remission. In contrast, professional plaque control is actually recommended for routine pre-pubertal or pregnancy-associated gingivitis and is part of the initial care for ulcerative (necrotizing) gingivitis. [Abdullah 2002 PMID 11896823; Rickles 2007 PMID 18023721]