Task: Text Matching
Input (English): Sentence1: What is the difference between Refractory Chronic Migraines and Transformed Migraines? With CM do I need a headache specialist for general nuero? 
 Sentence2: I was diagnosed with chronic migraine in my childhood and there hasn't been any episode for last 2-3 years. I experienced severe headache last night and I am wondering if it is due to refractory chronic migraine or transformed migraine. Can you help me with the differences between these two types of migraine? Also, should I consult a headache specialist or general neurologist with my chronic migraine?
Output (English): Similar