A cholesteatoma is a tumor that typically produces:

A cholesteatoma is characterized by the abnormal growth of skin cells in the middle ear and mastoid process, which can often lead to a variety of symptoms. One of the hallmark features of a cholesteatoma is the production of an odorous discharge, which occurs due to the accumulation of necrotic tissue, bacteria, and debris. This discharge is typically foul-smelling and can be a key indicator during the examination of a patient presenting with ear-related issues.

In contrast, terms like fenestration and stapedectomy refer to surgical procedures rather than symptoms or characteristics associated with tumors. Sensorineural hearing loss may occur with various types of ear pathologies but is not a direct product of cholesteatomas. Therefore, the presence of an odorous discharge is the correct answer, as it directly relates to the condition of a cholesteatoma and its clinical manifestations.