This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'Most common complication of IUCD \nSelect and explain. \nA. Bleeding, B. Pain, C. PID, D. Aboion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The commonest complaint of women fitted with an IUCD is increased vaginal bleeding The bleeding may be greater in volume during menstruation or a longer periods or mid cycle bleeding Reference: Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 498', 'role': 'assistant'}]