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: Pharmacology
Oral contraceptive pills can cause all except: 
Select and explain. 
A. Mastalgia, B. Dysmenorrhea, C. Chloasma, D. Breakthrough bleeding
B: Dysmenorrhea
Answer: B: Dysmenorrhea 
Explanation: Side effects of OCPs are breakthrough bleeding, mastalgia, chloasma, carbohydrate intolerance, weight gain. No dysmennorhea is seen.(Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.325)