This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Gas pack is commonly used to grow: \nSelect and explain. \nA. Pseudomonas aeruginosa, B. Clostridium tetani, C. Klebsiella, D. Treponema pallidum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Pseudomonas aeruginosaGas pak system is the most commonly used method for anaerobiosis as it is simple.It uses a sachet containing sodium bicarbonate and sodium borohydride which react chemically with O2 in presence of water, to produce H2 and CO2 .', 'role': 'assistant'}]