In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

[EX Q]: Sentence 1:During the growing season , the sun shines on a vertical surface at an extreme angle such that much less light is available to crops than when they are planted on flat land . Sentence 2:Therefore , supplemental light would be required .
[EX A]: therefore

[EX Q]: Sentence 1:The mechanisms for infection , proliferation , and persistence of a virus in cells of the host are crucial for its survival . Sentence 2:For example , some diseases such as measles employ a strategy whereby it must spread to a series of hosts .
[EX A]: for example

[EX Q]: Sentence 1:According to doctors , he suffered with mild stroke and he is out of danger . Sentence 2:However , the doctors suggested to him to remain in the hospital for some days .
[EX A]:
however