Answer:A weak immune system
Explanation:
When people get older their immune system becomes weak including the function of the T cells which are cells responsible for fighting infections.
This means it becomes hard to recover from a flue when someone get sick and they are always prone to sickness since their immune system no longer has the power to fight infections.
The correct interpretation of this case is that antibiotic A is the only one that effectively fights the patient's bacteria.
<h3>How to interpret the results?</h3>
To interpret the results of this case, we must take into account the manifestations that occur with respect to the antibiotic samples A, B, C and D and their reaction with the bacteria in the patient's wound.
According to the above, it can be inferred that antibiotic A eliminated the bacteria, while the other three antibiotics allowed the proliferation of bacteria.
Learn more about antibiotics in: brainly.com/question/10868637
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I think the answer is a I hope this helps:)