Answer: (b)
The glucose content of gingival fluid and blood was found to be higher in diabetics. Thickening of the basement membrane of capillaries may hamper the transport of nutrients. The increased susceptibility of diabetics to infection has been hypothesized as being due to PMN deficiencies resulting in impaired chemotaxis, defective phagocytosis, or impaired adherence.
Glickman’s Clinical Periodontogy 6th ed. pp. 464-465

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