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Pentose and hexose are the most common
(a) Oligosaccharide
(b) Disaccharide
(c) Monosaccharide
(d) Polysaccharide

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Answer
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Hint: The molecular formula of pentose and hexose are ${ C }_{ 5 }{ H }_{ 10 }{ O }_{ 5 }$ and ${ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }$ respectively. They are similar to the basic formula of monosaccharide.

Complete step by step answer:
Pentose and hexose are common types of monosaccharides. Pentose is a five-carbon monosaccharide, whereas hexose contains six carbon atoms. The chemical formula of both pentose and hexose is similar to the basic formula of monosaccharide, i.e. ${ C }_{ n }{ H }_{ 2n }{ O }_{ n }$.
So, the correct answer is, ‘(c) Monosaccharide’.

Additional Information: Pentose is a five-carbon molecule with molecular formula ${ C }_{ 5 }{ H }_{ 10 }{ O }_{ 5 }$. Whereas, a hexose is a six-carbon compound whose molecular formula is ${ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }$. Both pentose and hexose are monosaccharides. Monosaccharides are the simplest form of sugar with the basic formula as ${ C }_{ n }{ H }_{ 2n }{ O }_{ n }$. Glucose is a common example of hexose and the most common pentose are ribose, fructose, etc. The structures of pentose and hexose are given below,
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Now, let us know more about the other three sugars in the question.
Oligosaccharide: These are the chains of small monosaccharides (usually 2-9).
Disaccharide: Disaccharides are formed by a combination of two monosaccharides. Some examples of disaccharides are- sucrose, maltose, etc.
Polysaccharide: These are complex carbohydrates. These consist of a polymer of large numbers of monomers. Glycogen, starch, cellulose, etc. are examples of polysaccharides.

Note: The molecular formula and structures of pentose and hexose are similar to monosaccharides. They don’t show any noticeable similarity with oligosaccharide, disaccharide, or polysaccharide.