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Which lactase preparation is suitable for milk treatment?

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Which lactase preparation is suitable for milk treatment?

(a) Aspergillus Oryzae

(b) Kluyveromyces fragilis

(c) Aspergillus Niger

(d) Bacillus acidopullulyticus

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I'm obligated to ask this question of Large Scale Use of Enzyme in section Large Scale Use of Enzyme in Solution of Enzyme Technology

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The correct option is (b) Kluyveromyces fragilis

To explain: Lactase produced from Kluyveromyces fragilis has an optimum pH of 6.5-7 and hence is suitable for use in milk treatment. Lactase preparation from Aspergillus Oryzae and Aspergillus Niger has an optimum pH of 4.5-6 and 3-4 respectively and hence is more suitable for whey hydrolysis. Bacillus acidopullulyticus is used in the production of pullulanase which cleaves only α-1, 6-links are to give straight-chain maltodextrins.

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