This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), Subject name: Microbiology
Which one of the following bacteria is facultative anaerobe? 
Select and explain. 
A. Pseudomonas, B. Bacteroides, C. Escherichia, D. Clostridia
C: Escherichia
Answer: C: Escherichia 
Explanation: 1. All member of Enterobacteriaceae family are facultative anaerobes. MEMBERS OF ENTEROBACTERIACEAE:- Escherechia,Shigella,Citrobacter,Klebsiella,Enterobacter,Hafnia,Serratia,Salmonella,Proteus,Morganella,Providencia,Yesenia. 2. Pseudomonas - strict aerobe 3. Clostridium and Bacteroids - Anaerobes