This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
A middle aged man comes to OPD with paraesthesia of hands and feet, hyperkeratosis of palms, rain drop pigmentation and transverse lines on nails. Most likely the person is having - 
Select and explain. 
A. Arsenic poisoning, B. Lead poisoning, C. Mercury poisoning, D. Cadmium poisoning
A: Arsenic poisoning
Answer: A: Arsenic poisoning 
Explanation: The man in question has :

(i) Paresthesia of hands and feet
(ii) Raindrop pigmentation
(iii) Hyperkeratosis of palm    
(iv) Transverse lines on the nail (mees' line)

All are seen in arsenic poisoning.