At Age 85, Lyle's Immune System Does Not Respond to Vaccines

question 58

Multiple Choice

At age 85, Lyle's immune system does not respond to vaccines as well as it did when he was younger. The atrophy of which endocrine gland is likely responsible for this?

• A) anterior pituitary
• B) adrenal
• C) thymus
• D) thyroid

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