Biochip contains

A biochip, also known as a DNA chip or microarray, is a small solid surface used to analyze biological molecules.

Biochips are primarily designed to contain DNA sequences fixed onto their surface, which are used for gene expression analysis, mutation detection, and genetic screening.

These DNA probes hybridize with complementary nucleic acid sequences from a sample, allowing detection and analysis.

Although RNA or proteins may be analyzed indirectly, the basic and essential component present on a biochip is DNA.

Hence, the correct answer is Option B – DNA.