Final answer:
The correct answer is a facultative anaerobe. This refers to a microorganism that can thrive in both the presence and absence of oxygen.
Step-by-step explanation:
Based on the given mnemonic, Mnemonic: My Pretty Malar Marking Probably Has A Transient Quality: A
A. an aerotolerant anaerobe
B. an obligate aerobe
C. an obligate anaerobe
D. a facultative anaerobe
The correct answer is D. a facultative anaerobe. This refers to a microorganism that can thrive in both the presence and absence of oxygen. It can carry out aerobic respiration when oxygen is available, but can also switch to anaerobic respiration or fermentation when oxygen is not available.