Bacteria that can grow even in the presence of antiseptic-
**Core Concept**
Bacteria that can grow even in the presence of antiseptics are known as **antibiotic-resistant** or **antiseptic-resistant** bacteria, but more specifically, this phenomenon is characteristic of **persister cells**. Persister cells are a subpopulation of bacteria that can survive and grow even in the presence of lethal concentrations of antibiotics or antiseptics due to their unique physiological state.
**Why the Correct Answer is Right**
Persister cells are thought to arise from a process called **stochastic expression of genes**, where individual bacteria undergo a random and temporary switch to a dormant or persister state. This state allows them to survive the antibiotic or antiseptic treatment, and upon removal of the stressor, they can revert to their normal growth state. Persister cells are often seen in bacteria such as **Escherichia coli** and **Staphylococcus aureus**, and are a major concern in the development of antibiotic resistance.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically address the concept of bacteria growing in the presence of antiseptics. It is too vague and does not provide a clear explanation.
**Option B:** This option is incorrect because it refers to bacteria that are **sensitive** to antibiotics or antiseptics, which is the opposite of what we are looking for.
**Option C:** This option is incorrect because it refers to **bacteriophages**, which are viruses that infect bacteria, rather than bacteria themselves.
**Clinical Pearl / High-Yield Fact**
Persister cells are a major concern in the development of antibiotic resistance because they can survive and grow even in the presence of high concentrations of antibiotics, making them a key target for new antibiotic development.
**Correct Answer:** D.