Which of the following was used in ancient Rome for health and social purposes?

The frigidarium was a specific part of the ancient Roman bath complex that played a notable role in health and social interaction. It was the cold-water pool area where bathers would immerse themselves to refresh and invigorate after using the hot baths. This practice contributed to both physical well-being and social engagement, as people often gathered in these communal spaces to socialize, discuss various matters, and enjoy a break from the heat.

In addition to its health benefits, the frigidarium served as a social hub where individuals could relax and converse, making it an essential part of Roman social culture. The combination of its health benefits through temperature regulation and its role as a social gathering place highlights the frigidarium's significance in ancient Roman society.

While other options like the forum and hypocaustum were integral to Roman life and society, they served different functions. The forum was primarily a marketplace and center for civic life, while the hypocaustum was a system for heating baths and villas, not directly related to health and socialization in the same way as the frigidarium. Garum, a fermented fish sauce, was a popular condiment, but it did not directly fulfill health and social purposes in the same impactful manner as the frigidarium.