A man,after skinning a dead animal,developed a pustule on his hand.A smear prepared from the lesion showed the presence of Gram positive bacilli in long chains which were positive for McFadyean's reaction.The most likely aetiological agent is:

• A. Listeria monocytogenes
• B. Clostridium tetani
• C. Actinomyces sp
• D. Bacillus anthracis