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.

Q: Sentence1: Does lung cancer always effect oxygen levels. 
 Sentence2: I was diagnosed with lung cancer and I have been on therapy. My oxygen saturation levels have been around 90% and I am worried if this is ever going to improve. Should I ask my doctor if therapy needs to be changed?

A: Dissimilar
****
Q: Sentence1: Please provide advice on discontinuing hctz (hydrochlorothiazide) after developing petechiae on my arms. I have been taking hctz (hydrochlorothiazide) for 3 months and this just started. 
 Sentence2: Is hydrochlorthiazide safe for the elderly?

A: Dissimilar
****
Q: Sentence1: Can i drink coffee to avoid a headache? 
 Sentence2: Can caffeine result in headaches?

A:
Dissimilar
****