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 presents with parasthesia of hands and feet. Examination reveals presence of `Mees' lines in the nails and rain drop pigmentation in the hands. The most likely causative toxin for the above mentioned symptoms is - 
Select and explain. 
A. Lead, B. Arsenic, C. Thallium, D. Mercury
B: Arsenic
Answer: B: Arsenic 
Explanation: None