Fecal matter from coelenteron of hydra is expelled out from:

Fecal matter from coelenteron of hydra is expelled out from: Hypostome

• Hydra belongs from phylum Cnidaria and class hydrozoa.
• They have a hypostome, surrounded by a number of tentacles. 
• The waste product released from cells of hydra gets into the coelenteron from which it goes out through the hypostomal opening.
• Hydra is a multicellular eukaryotic organisms that depend on another organisms for their nutrition.

Hence, option A is the correct answer.