You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is What is the most likely cause of this presentation? and explain in detail?
Answer A. ChemotherapyThese multiple white lines on the fingernails, known as Beau's lines, correspond with chemotherapy cycles in this patient with gastric cancer. Cytotoxic chemotherapeutic agents can induce the temporary arrest of proliferative function of the nail matrix.