Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. If the conversation begins with a question, label it '1' otherwise '0'.
Input:  Person1:     Do you object to drinking black tea , Mr.Zhang ?  
 Person2:  Yes , that is why I never drink it .  
 Person1:      Do you drink green tea , then ?  
 Person2:  Very seldom , because tea has tannin which may be harmful to one's health .  
 Person1:      But if the tea is good and well prepared , it will do much good .  
 Person2:  What good is it for ?  
 Person1:      Not only can it appease one's thirst , but it can also refresh one when tired .  
 Person2:  That's true , but it must not be allowed to stand long .  
 Person1:      Why is it so ?  
 Person2:  Because if you drink a kind of tea which has been prepared for some time before , it will do you harm . 

1