What is a common symptom associated with biotin deficiency?

Biotin deficiency commonly presents with a variety of symptoms due to its vital role in several metabolic processes, particularly in the metabolism of carbohydrates, fats, and proteins. Each of the options reflects symptoms that can be associated with biotin deficiency.

A skin rash, often resembling seborrheic dermatitis, can appear in biotin deficiency as it impacts skin health and renewal. This rash typically manifests as scaly or irritated patches, particularly around the eyes, nose, and mouth.

Hair loss is another symptom that can occur due to insufficient biotin levels. Given biotin's importance in keratin production, a deficiency can lead to brittle hair and subsequent hair loss or thinning.

Lactic acidosis, while not as commonly highlighted, can occur in the context of a broader metabolic derangement related to deficiencies in metabolic coenzymes like those that rely on biotin. The inability to appropriately utilize certain substrates can lead to lactic acid accumulation.

Considering all of these factors, it's clear that biotin deficiency can lead to a range of symptoms, making all listed symptoms possible manifestations of this nutritional deficiency.