A 92-year-old female patient presents with complaints regarding her nails. She states they often crumble, and have been yellowish in color for years. Her toenails are so thickened that it is difficult to trim them. She is otherwise asymptomatic and has no fingernail involvement. What is the most common cause of this patient’s condition?

A. Tinea manuum

B. Tinea pedis

C. Inflammatory disease of the nail

D. Acquired from an injury to the foot

E. Hereditary disorder

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