What symptom is least likely to be associated with vitamin C deficiency?

Pigeon breast, or "pectus carinatum," refers to a structural deformity of the chest where the breastbone protrudes outward. This condition is typically congenital or related to connective tissue disorders and is not a symptom that is associated with vitamin C deficiency.

In contrast, scurvy is a well-recognized disease resulting from a lack of vitamin C, marked by symptoms such as fatigue, weakness, and swollen, bleeding gums. Similarly, petechiae, which are small red or purple spots caused by bleeding under the skin, are often seen in vitamin C deficiency due to its essential role in collagen synthesis and blood vessel integrity. Additionally, anemia can occur with vitamin C deficiency because vitamin C enhances the absorption of non-heme iron from plant sources. Therefore, while all the other symptoms are strongly linked to vitamin C deficiency, pigeon breast does not have this association, making it the least likely symptom related to this particular deficiency.