Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The opening in the front of the eye is called pupil.

Answer: What is the opening in the front of the eye called?

Question: Trichomoniasis is cause by a protozoa.

Answer: Trichomoniasis is cause by what type of pathogen?

Question: Human facial expressions can communicate emotions.

Answer:
What can human facial expressions communicate?