Concept:
Glands are specialized organs that produce and release hormones or secretions. The endocrine system contains several important glands responsible for regulating body functions.
Examples of endocrine glands include:
\[
\text{Hypothalamus, Adrenal gland, and Pancreas}
\]
Alveoli are tiny air sacs in the lungs, while the liver is primarily a digestive and metabolic organ rather than a primary endocrine gland in this context.
Step 1: Identify the endocrine glands.
Among the given structures:
\[
\text{Hypothalamus, Adrenal, and Pancreas}
\]
function as glands.
Step 2: Eliminate non-gland structures.
• Alveoli are involved in gas exchange in the lungs.
• Liver performs metabolic and digestive functions.
Step 3: Choose the correct combination.
Thus, the correct set is:
\[
B, C, D
\]
Hence, the correct answer is:
\[
\boxed{(A)\ B, C, D\ \text{only}}
\]