Which symptom is a common manifestation of B12 deficiency anemia?

Tingling and numbness of both feet is a common manifestation of vitamin B12 deficiency anemia due to the vitamin's crucial role in maintaining the health of the nervous system. B12 is essential for the production of myelin, the protective sheath that surrounds nerves. A deficiency in B12 can lead to neurological symptoms, including peripheral neuropathy characterized by tingling, numbness, or a "pins and needles" sensation in the extremities.

While spoon-shaped nails and pica may be associated with iron deficiency anemia, and an abnormal neurological exam can indicate broader neurological issues not specific to B12 deficiency, the tingling and numbness specifically relate to the nerve damage that can occur from prolonged B12 deficiency. A vegan diet can increase the risk of B12 deficiency but is not itself a symptom of the condition. Thus, the correct association between the symptom and B12 deficiency is accurately represented by the sensation of tingling and numbness in the feet.