Which of the following organisms produces no haze in a broth culture?

The organism that produces no haze in a broth culture is Ureaplasma urealyticum. This bacterium is known for lacking a cell wall, which distinguishes it from many other types of bacteria. As a result, Ureaplasma urealyticum has a very small size and doesn't form visible colonies or cause turbidity (haze) in liquid cultures.

Mycoplasma hominis and Mycoplasma pneumoniae, similar to Ureaplasma, also lack a cell wall; however, certain conditions can allow for some growth that might produce minimal turbidity, especially in specialized culture media. Chlamydia psittaci, on the other hand, is an intracellular organism that requires living cells for growth and does not typically form a broth culture in a conventional sense, but when cultured, may also lead to hazy results.

Therefore, out of the choices provided, Ureaplasma urealyticum is the most consistent with producing a clear broth culture, making it the correct answer.