Which of the following terms refers specifically to "sac, urinary bladder, pouch"?

The term that specifically refers to a "sac, urinary bladder, pouch" is Cyst/o. This prefix is commonly used in medical terminology to describe conditions relating to the urinary bladder or fluid-filled sacs in the body. The word 'cyst' in medical terms often denotes a structure that contains liquid, thus aligning with the definition given.

Cyst/o is utilized in various medical terms, such as cystitis (inflammation of the bladder) and cystoscopy (a procedure to look inside the bladder). This clear connection to the urinary bladder highlights why this term is the correct choice for indicating a sac or pouch related to the urinary system.

In contrast, other terms like Dacry/o refer to tears or tear ducts, Dent/o is related to teeth, and Cyt/o pertains to cells. Each of these terms has distinct meanings that do not connect to the concept of a sac or pouch, particularly regarding the urinary bladder. This specificity in the meaning of Cyst/o makes it the accurate answer for the question.