Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Trichomoniasis is cause by a protozoa.
Trichomoniasis is cause by what type of pathogen?

You call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars, elliptical galaxies.
What do you call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars?

Under a crushed sugar cube is added and the water is stirred conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature.

Under which conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature?