Parotid duct opens into the oral cavity opposite the:
Correct option is B, Second upper molar. In Digestive System, the accurate description is Second upper molar, and that is what you should commit to memory. Keep the definition tight and the role clear — Second upper molar is the option that correctly names the structure, process, or principle asked for in Digestive System. Then Second upper molar is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Second upper molar.
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.