Outermost skin layer or stratum corneum of Frog consists of

Columnar unkeratinised cells

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Flat keratinised cells

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Flat non-keratinised cells

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Columnar keratinised cells

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Solution

The correct option is C Flat keratinised cells
The outermost layer of frog skin, the stratum corneum, is composed of a thin layer of keratinized cells, preventing pathogens from entering, and is a stratified squamous epithelium, composed of proliferating basal and differentiated suprabasal keratinocytes.
So the correct answer is 'Flat keratinised cells'

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