<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: With DMPA, the next injection may be taken latest by:
Options:
A. 12 weeks
B. 13 weeks
C. 15 weeks
D. 17 weeks
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is D: 17 weeks. Explanation: DMPA is effective for 13 weeks. It has grace period of 4 weeks, which means that this woman can get her next injection before completed 17 weeks. If she comes later than 17 weeks, then she will be given injection but will have to use backup for next 7 days, as injections would take time to become effective.<|im_end|>
