Site of fertilization in humans is usually the:
Ampulla of oviduct (C) is the right choice. This sits at the heart of Reproductive System: 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: Ampulla of oviduct is the option that correctly names the structure, process, or principle asked for in Reproductive System. That reasoning supports Ampulla of oviduct. 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 Ampulla of oviduct from memory, then reveal the letter — that habit builds real recall for Reproductive System.
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.