Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Crossed cousin marriage is not allowed in China .  
 Person2:It it true of many countries .  
 Person1:        You know why ?  
 Person2:Sure . If people are near in blood , they might pass on some genetic disease to the next generation . 

formal