This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Psychrophilic bacteria grow best at which of the following temperatures? \nSelect and explain. \nA. <20degC, B. 30-37degC, C. 50-0degC, D. >60degC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (< 20degC) (Ref. Ananthanarayan Microbiology 7th/pg. 22)On the basis of temperature relationship, microorganisms are broadly divided into three groups:Phychrophiles grow optimally at0-5degCMesophiles at20~45degCThermophiles> 55degCMany yeasts and molds and, certain bacteria grow well in acidic media (pH 5.0 or lower) while most bacteria require a pH near neutrality (6.5-8.0) for optimal growth.', 'role': 'assistant'}]