This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dysmenorrhoea , Subject name: Gynaecology & Obstetrics
In dysmenorrhoea indomethacin works by - 
Select and explain. 
A. Inhibiting prostaglandin synthetase, B. Suppressing ovulation, C. Reducing inflammation, D. Relaxing smooth muscle
A: Inhibiting prostaglandin synthetase
Answer: A: Inhibiting prostaglandin synthetase 
Explanation: Ans. is 'a' i.e., Inhibiting prostaglandin synthetase Medical measures to relieve dysmenorrheao Analgesics paracetamol and piroxicam.o Antispasmodies hyoscine, camylofin, and drotaverineo Prostaglandin synthetase inhibitors inhibiting cyclo-oxygenaseMefenamic acid, indomethacin, naproxen, ibuprofen.o Smooth muscle relaxantGlyceryltrinitrateo Progestogen containing IUCDMirena and progestasert - reduce pain, provide contraception and reduce bleeding, o Cyclical oral contraceptive drugso Vitamin E