<prompt> Organism showing Medusa head appearance and Bamboo stick appearance in blood culture medium. What is the likely organism?Bacillus anthracisCorynebacterium diphtheriaClostridium perfringensVibrio cholerae  <response>: A Bacillus anthracis APPEARANCES OF THE COLONIES: Bacteria Appearance Staphylococci - Oil paint appearance nutrient agar Pneumococci - Draughtmann carom coin appearance blood agar Corynebacterium - Chinese letter or cuneiform arrangement Bacillus anthracis Bamboo stick appearance Medusa head appearance agar plates Inverted fir tree appearance gelatin stab culture Cl. perfringens Stormy fermentation litmus milk Target haemolysis rabbit, sheep, human blood agar Cl. tetani - Drum stick appearance Vibrio cholarae - Fish in stream appearance Yersinia pestis Safety pin appearance Stalactite growth H. influenzae - Satellitism H. ducreyi - School of fish Rail road track appearance Bordetella pertussis Thumb print appearance Bisected pearls mercury drops Bordet-Gengou medium Aluminium paint appearance M. leprae - Cigar bundle appearance Mycoplasma - Fried egg appearance 