a) Lactobacillus bulgaricus and Streptococcus thermophilus
b) Lactobacillus bulgaricus and Propionibacterium
c) Lactobacillus bulgaricus and Leuconostoc
d) Leuconostoc and Propionibacterium
Answer: a
Explanation: The bacteria used to make yogurt are known as “yogurt cultures”. Lactobacillus bulgaricus and Streptococcus thermophilus are two strains used in yogurt preparation.
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