Ancillary means which of the following?

• A. Serving as an aid or accessory; auxiliary; N.
• B. Primary or essential
• C. External
• D. Adhesive

Answer: (A)

Ancillary describes something that serves as a help or accessory, a supplementary part that supports the main function. In health care, ancillary services and staff provide additional support to the primary clinicians, making care possible but not the central act. That sense—being an aid or auxiliary—is why this choice is correct.

The other ideas don’t fit: being primary or essential would make it the main element, which is the opposite of ancillary; external implies location or outside status, which isn’t the intended meaning here; adhesive refers to sticky substances, unrelated to being supplementary.