What is an overt sign of a possible B vitamin deficiency?

Question

What is an overt sign of a possible B vitamin deficiency? ​

Quizplus · Accepted Answer

A smooth tongue, also known as glossitis, is a common overt sign of a possible B vitamin deficiency, specifically B2 (riboflavin), B3 (niacin), B6 (pyridoxine), or B9 (folate). Other signs may include fatigue, weakness, and neurological symptoms such as depression and confusion. Anemia may also be a sign of a B vitamin deficiency, but it is not an overt sign as it can have many different causes. Abnormal liver or heart function may be caused by many different factors and are not specific to B vitamin deficiency.

What Is an Overt Sign of a Possible B Vitamin