Microbiology Which of the following is a characteristic feature on culture of Streptococcus pneumoniae organism? A Alpha-hemolytic colonies inhibited by optochin on blood agar and lysed by bile B Beta-hemolytic colonies that are bacitracin-resistant on blood agar C Beta-hemolytic colonies that are inhibited by bacitracin on blood agar D Catalase-negative organisms that hydrolyze esculin in 40% bile and 6.5% NaCI 💡 Explanation Which of the following is a characteristic feature on culture of Streptococcus pneumoniae organism? ✓ Correct Answer: A. Alpha-hemolytic colonies inhibited by optochin on blood agar and lysed by bile