Which symptom is not typically associated with biotin deficiency?

Biotin deficiency is characterized by several specific symptoms, including dermatitis, alopecia, and neurological issues. Dermatitis often presents as seborrheic dermatitis, which can cause scaly patches and inflammation on the skin. Alopecia is a common finding as well, with hair loss occurring in patches or overall thinning.

Diarrhea can occur in biotin deficiency due to impaired functioning of the gastrointestinal tract, which may result from the lack of this crucial vitamin. However, lactic acidosis is not associated with biotin deficiency. This metabolic disturbance more often occurs due to various other conditions, such as mitochondrial disorders or severe infections, which lead to an increase in lactate production or decreased lactate clearance. Thus, lactic acidosis is not a symptom linked with biotin deficiency, making it the correct choice for this question.