The upper half of the oesophagus contains:

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(D) The oesophagus is a muscular tube. The muscularis layer of the upper one-third of the oesophagus consists of striated (skeletal) muscles,which are

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Both $(a)$ and $(b)$

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(D) The oesophagus is a muscular tube. The muscularis layer of the upper one-third of the oesophagus consists of striated (skeletal) muscles,which are under voluntary control. The middle portion contains a mixture of both striated and smooth muscles,while the lower one-third consists entirely of smooth (unstriated) muscles. Since 'striped' and 'skeletal' muscles are synonyms,both options $(a)$ and $(b)$ refer to the same type of muscle tissue. Therefore,the correct answer is $(d)$.

Column $I$ (Part of the alimentary canal)	Column $II$ (Length)
$i$. Duodenum	$b$. $26 \ cm$
$ii$. Jejunum	$c$. $2.5 \ m$
$iii$. Ileum	$d$. $3.5 \ m$
$iv$. Large intestine	$a$. $1.5 \ m$

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Column $I$ (Part of the alimentary canal) Column $II$ (Length)
$i$. Duodenum $b$. $26 \ cm$
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$iii$. Ileum $d$. $3.5 \ m$
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