**Core Concept**
The tRNA molecule has specialized structural arms that perform distinct functions in protein synthesis. The pseudouridine arm is a key structural element involved in tRNA recognition and interaction with the ribosome, particularly in stabilizing the tRNA’s conformation during translation.

**Why the Correct Answer is Right**
The pseudouridine arm contains pseudouridine residues (uridine modified to a non-ribose form), which enhance tRNA stability and facilitate proper folding. This arm interacts with ribosomal components and helps position the tRNA correctly on the ribosome. While the acceptor and anticodon arms are involved in amino acid attachment and codon-anticodon pairing, respectively, the pseudouridine arm specifically contributes to tRNA-ribosome interface dynamics and structural integrity.

**Why Each Wrong Option is Incorrect**
Option A: The DHU (dihydrouridine) arm is involved in tRNA flexibility and stability but does not bind to the ribosomal surface.
Option C: The acceptor arm binds the amino acid and attaches to the ribosome’s A-site, but it is not the arm that anchors tRNA to the ribosomal surface.
Option D: The anticodon arm recognizes mRNA codons and is located in the tRNA’s elbow region; it does not directly bind to the ribosomal surface.

**Clinical Pearl / High-Yield Fact**
Pseudouridine modifications are crucial for tRNA stability and function; their absence can lead to translational defects and are linked to certain genetic disorders. Always remember: the **pseudouridine arm** is responsible for ribosomal interaction, not amino acid or codon binding.

✓ Correct Answer: B. Pseudouridine arm