What is the proper minimum amount of clothing required for the exam?

The option that states "Underwear and a gown" is considered the proper minimum amount of clothing required for the exam because it aligns with the standard requirements for medical examinations specifically in the context of commercial motor vehicle drivers. During such examinations, candidates are typically required to wear minimal clothing to allow medical professionals to conduct physical assessments without obstructions. The gown serves as a practical option for ensuring the individual is adequately covered while maintaining accessibility for the examination.

Other choices, while they may be acceptable in casual settings or different types of examinations, do not meet the necessary criteria for the medical evaluation required under FMCSA guidelines. For instance, sweatpants and a T-shirt, or shorts and a sleeveless top may not provide the same level of accessibility or modesty expected in medical examinations. Business casual attire, while appropriate for many professional environments, does not cater to the specific requirements of a medical evaluation.