<prompt> A pus culture on chocolate agar shows gram-negative cocci most likely organism isHemophilus ducreyiNisseria gonorrhoeaeStreptococcus pyogenesStreptococcus pneumoniae  <response>: Streptococcus pneumoniae and Streptococcus pyogenes are gram-positive cocci. Hemophilus ducreyi is ovoid bacilli. It is gram negative but may appear gram-positive and frequently show bipolar staining. Gonococci is a gram-negative coccus. Reference: Textbook of Microbiology; Anathanarayan and panickers; 10th edition; Page no: 236 