Discussion
Vaginal secretion consists of
Answer: B
Vaginal secretion contains Doderlein's bacilli, option B. These are lactobacilli that live in the normal vagina and produce lactic acid, which keeps the secretion acidic, and their presence is used in the examination of vaginal swabs. Urea (A) is a constituent of urine and sweat, glyoxalase I (C) is an enzyme of the red cells that is used in the typing of blood, and serum cholinesterase (D) is a plasma enzyme. Glyoxalase I is a red cell enzyme used in blood grouping, and serum cholinesterase is an enzyme of the plasma, so neither is a normal constituent of the vaginal secretion in the sense used here.
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