The correct answer is (c). Biochips contain both RNA and DNA. They are used to detect and analyze biological molecules, such as DNA, RNA, and proteins. Biochips are made up of a small, solid surface that is coated with thousands or even millions of tiny probes. These probes are designed to bind to specific molecules, such as DNA or RNA. When a sample containing these molecules is applied to the biochip, the probes bind to the molecules and form a signal. This signal can then be detected and analyzed to provide information about the sample.
Option (a) is incorrect because biochips do not contain RNA only. Option (b) is incorrect because biochips do not contain DNA only. Option (d) is incorrect because biochips do not contain RNA, DNA, and protein.