This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
BAL (British anti-Lewisite, Dimercaprol) is of no value for the treatment of poisoning by 
Select and explain. 
A. Arsenic, B. Mercury, C. Zinc, D. Selenium
D: Selenium
Answer: D: Selenium 
Explanation: BAL (British anti-Lewisite, Dimercaprol) is a dithiol-chelating agent used in the treatment of poisoning by the heavy metals.It is of no value for the treatment of poisoning by selenium, iron, or cadmium; in fact, it is contraindicated in these poisonings because the BAL metal (mercaptide) complex may be more toxic than the metal alone.