Final answer:
In a person with severe vitamin B deficiency, signs such as (A) glossitis, lesions on the lips, and cheilosis at the mouth corners may be evident during a physical exam.
Step-by-step explanation:
During a nutrition-focused physical exam in a person with severe vitamin B deficiency, one would possibly find symptoms such as glossitis, which is an inflammation of the tongue that often presents as a smooth, reddish tongue, characteristic lesions of the lips, and fissures at the angles of the mouth known as cheilosis. Although not mentioned in the question, other symptoms could include dermatitis, magenta tongue, and certain functional and organic disorders of the eye.
Severe deficiencies in other B vitamins can lead to diseases such as pellagra, characterized by dermatitis, diarrhea, and dementia, and conditions like Beri-Beri and Wernicke's encephalopathy, which have symptoms including polyneuritis, edema, cardiovascular changes, and weakness.