<prompt> Mees line on nail is diagnostic of ?Lead poisoningArsenic poisoningWhite phosphorus poisoningMercury poisoning  <response>: Ans. is b i.e., Arsenic poisoning Chronic arsenic poisoning First stage of gastrointestinal nutritional disturbance: Gradual emaciation is earliest sign Anorexia, nausea, vomiting, diarrhoea abdominal cramps Second catarrhal stage Features of common cold, bronchial catarrhal, coughing hoarseness Third stage of skin rash Skin irritation, vesicular eruption resembling nettle rash Patchy brown raindrop type pigmentation Hyperkeratosis of palms soles Falling of hair brittleness of nail White transverse band or Mees line on nail Fouh stage of nervous disturbance Sensory motor neuropathy causing tingling, numbness paresis Encephalopathy Bone marrow suppression, anemia, weight loss, hepatomegaly, cirrhosis, nephritis, thrombocytopenia, leukemia, skin, lung, liver, bladder kidney cancer and exfoliative dermatitis diabetes. 