Question

In the following diagram, what does A, B, C and D indicate?

• A. A - Parafollicular cells, B - Leydig cells, C - Follicle, D - Colloid
• B. A - Parafollicular cells, B - Stroma, C - Trophoblasts, D - Colloid
• C. A - Follicle, B - Parafollicular cells, C - Follicular cells, D - Colloid
• D. A - Trophoblasts, B - Colloid, C - Follicular cells, D - Stroma

Hint:

The diagram shows thyroid follicles; identify the sac, the cells in between and the lining cells.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The section shows the thyroid gland with round sacs called follicles.

Step 2: Identify the labels
A marks a whole sac, which is a follicle.
B marks scattered cells between follicles, which are parafollicular cells that make calcitonin.
C marks the cuboidal cells lining the follicle, which are follicular cells that make thyroid hormones.
D marks the pink material inside the sac, which is the colloid.

Step 3: Compare the options
The third option reads A - Follicle, B - Parafollicular cells, C - Follicular cells, D - Colloid.

Final Answer:
The labels are A - follicle, B - parafollicular cells, C - follicular cells, D - colloid. \[ \boxed{\text{(C) }\text{A - Follicle, B - Parafollicular cells, C - Follicular cells, D - Colloid}} \]