system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Most common organism causing UI in adult?
assistant
The correct answer is  Ans. is 'd' i.e., Streptococcus pyogenes Most common cause of upper respiratory tract infection is viral infection. Rhinovirus is the most common cause. Among the bacteria, group A beta-hemolytic streptococci (streptococcus pyogenes) is the most common cause. And most common type of infection is pharyngitis.