Choose the pair that best represents a similar relationship to the one expressed in the original pair of words. DELTOID : MUSCLE

The correct answer is: B. brain : nerve

A deltoid is a muscle, while a brain is an organ. A muscle is a tissue that contracts to produce movement, while an organ is a structure that performs a specific function in the body. A brain is the control center of the body, while a nerve is a structure that carries messages from the brain to other parts of the body.

The other options are incorrect because they do not represent a similar relationship to the one expressed in the original pair of words.

• A radius is a bone, while a muscle is a tissue. Bones are rigid structures that provide support and protection for the body, while tissues are soft structures that make up the organs and other parts of the body.
• Blood is a fluid, while a vein is a blood vessel.
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