Parathyroid hormone is secreted by:
Chief cells (C) is the right choice. This sits at the heart of Endocrinology: the wording points straight to what is happening in the tissue or organ system. A useful study habit is to ask what the structure or process is for: Chief cells is the option that correctly names the structure, process, or principle asked for in Endocrinology. That reasoning supports Chief cells. One solid sentence about why this works is enough for recall — you do not need a long essay for every MCQ. When you practise, cover the choices first, write Chief cells from memory, then reveal the letter — that habit builds real recall for Endocrinology.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.