This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Which of the following would be least affected by injections of TSH? 
Select and explain. 
A. Uptake of Iodine by Thyroid, B. Synthesis of thyroglobulin, C. cGMP in Thyroid cells, D. Production of TSH
A: Uptake of Iodine by Thyroid
Answer: A: Uptake of Iodine by Thyroid 
Explanation: Thyroid-stimulating hormone (also known as thyrotropin, thyrotropic hormone, TSH, or hTSH for human TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T4), and then triiodothyronine (T3) which stimulates the metabolism of almost every tissue in the body. It is a glycoprotein hormone synthesized and secreted by thyrotrope cells in the anterior pituitary gland, which regulates the endocrine function of the thyroid.Ref: Ganong&;s review of medical physiology; 24th edition; page no-341