This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
A person working in an abattoir presented with malignant pustule on hand; What is the causative agent 
Select and explain. 
A. Clostridium botulinum, B. Clostridium perfringens, C. Streptococcus pyogenes, D. Bacillus anthracis
D: Bacillus anthracis
Answer: D: Bacillus anthracis 
Explanation: * Clinical clue here are: Abattoir who has contact with animal products; * Classical malignant pustule is seen in Anthrax. It occurs usually in face and neck * A papule is seen at the site of entry followed by vesicle and necrotic ulcer. * The lesion characteristic of cutaneous anthrax is central black eschar; this lesion is called as malignant pustule. Ref:- Ananthanarayan and Paniker's Textbook of Microbiology 10th ed; Pg num:- 250