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| List-$I$ | List-$II$ |
| $(a)$ Aspergillus niger | $(1)$ Lactic acid |
| $(b)$ Acetobacter aceti | $(2)$ Butyric acid |
| $(c)$ Clostridium butylicum | $(3)$ Acetic acid |
| $(d)$ Lactobacillus | $(4)$ Citric acid |
| Column-$I$ | Column-$II$ |
|---|---|
| $1$. Aspergillus niger | $(A)$ Acetic acid |
| $2$. Acetobacter aceti | $(B)$ Butyric acid |
| $3$. Clostridium butyricum | $(C)$ Citric acid |
| $4$. Lactobacillus | $(D)$ Lactic acid |
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