**Core Concept:** Acridine orange is a fluorescent dye used to stain DNA and RNA. It intercalates between base pairs of DNA and RNA, producing a fluorescent signal that can be visualized under a fluorescent microscope.

**Why the Correct Answer is Right:**
Acridine orange is a cationic dye that binds to the negatively charged nucleic acids (DNA and RNA) due to electrostatic interactions between the dye and the nucleic acids. The dye intercalates between the base pairs of DNA and RNA, causing a significant increase in fluorescence. This property allows for the visualization of nucleic acids in cells or tissues under a fluorescent microscope.

**Why Each Wrong Option is Incorrect:**
A. Option A is incorrect because acridine orange is a cationic dye, which binds to both DNA and RNA due to its positive charge and the negatively charged nucleic acids. This binding leads to fluorescence, not quenching.
B. Option B is incorrect because acridine orange is not specific to DNA and RNA. It binds to both nucleic acids, leading to staining of the nucleoli and nucleoplasm, as well as the cell membrane and cytoplasm.
C. Option C is incorrect because acridine orange is not a selective dye for acidic or neutral compartments. It binds to both acidic and neutral compartments due to its cationic nature and the negatively charged molecules in these compartments.
D. Option D is incorrect because acridine orange binds to nucleic acids, producing a fluorescent signal rather than quenching the fluorescence of other dyes.

**Clinical Pearl:** Acridine orange is a widely used fluorescent dye for staining nucleic acids in cells and tissues, providing information about the presence and distribution of nucleic acids. This property is particularly useful in microbiology, virology, and cellular biology studies. The dye's nonspecific binding to nucleic acids makes it a valuable tool for studying nucleic acid distribution in cells and tissues.