The wrongly matched pair is Coliforms — Vinegar. Vinegar (acetic acid) is produced by Acetobacter (acetic acid bacteria), not coliforms. Coliforms (e.g., E. coli) indicate fecal contamination of water. Methanogens produce methane (biogas/gobar gas); Yeast ferments sugar to ethanol; Streptomyces produces many antibiotics (e.g., streptomycin).