Final answer:
Bilateral breast enlargement in men, known as gynecomastia, can be caused by puberty, obesity, marijuana use, and cirrhosis, but it is typically not a result of breast cancer, which commonly presents as a unilateral enlargement or lump.
Step-by-step explanation:
The question asks which of the following is not a cause of bilateral breast enlargement in men: puberty, obesity, marijuana, cirrhosis, or breast cancer. Breast enlargement in men, also known as gynecomastia, can be due to various factors. These include hormonal changes during puberty, obesity, the influence of substances such as marijuana, and liver conditions like cirrhosis which can alter the body’s hormone balance. Breast cancer, while it can present as a lump or enlargement, typically does not cause symmetrical bilateral enlargement. Instead, breast cancer usually presents with unilateral (one-sided) lumps or changes in the breast.
Regarding the provided reference information, there are mentions of conditions with adverse effects that can be cured surgically. However, they are not directly correlated to the causes of bilateral breast enlargement in men, which is the focus of this question. It is also important to clarify that breast cancer in men, although less common than in women, does occur and should be evaluated by a physician if suspected.