In this task you are given a medical question pair hand-generated. Your task is to classify a given post into two categories 1) 'Similar' if the given two questions have a same connotation 2) 'Dissimilar' if the given two questions have a different connotation or meaning.
--------
Question: Sentence1: What can cause me to be lightheaded/dizzy? 
 Sentence2: I am a healthy 25 year old but for the past few days, I have been feeling lightheadedness and dizzy, do you know what might be the cause?

Answer: Similar


Question: Sentence1: At times it stings/strikes me inside my head? Is it cause of sleep or cold or something else? 
 Sentence2: I have not been sleeping well for the past few days because of a cold. Can this cause a sharp striking/stinging pain in my head?

Answer: Similar


Question: Sentence1: Late menstrual period after bad carwreck? 
 Sentence2: I am late for my period. Can I be pregnant?

Answer:
Dissimilar