A) stomach
B) oesophagus
C) intestine
D) rectum
Correct Answer: B
Solution :
Oesophagus is single, ectodermal, and dorsal to trachea, approximately 25 cm long. Esophagus lacks digestive gland but multicellular glands are found, which extend up to submucosa. Due to the presence of these submucosal mucosa glands, submucosa of oesophagus is thickest than other parts of alimentary canal.
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