In this task, you are given two sentences in the English language and your task is to classify them into one of their discourse types. A discourse type is an indicator to classify the given two sentences on the basis of a co-text as well as a relevant context. There are 13 discourse types in total which are 'SINGLE_S_COORD', 'SINGLE_CATAPHORA', 'SINGLE_CONN_INNER', 'SINGLE_APPOSITION', 'SINGLE_VP_COORD', 'SINGLE_CONN_START', 'PAIR_ANAPHORA', 'PAIR_CONN', 'SINGLE_RELATIVE', 'SINGLE_CONN_INNER_ANAPHORA', 'SINGLE_S_COORD_ANAPHORA', 'PAIR_CONN_ANAPHORA' and 'PAIR_NONE'.
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Question: Sentence 1:David Nabarro , the newly appointed Senior United Nations System Coordinator for Avian and Human Influenza , warned the world that an outbreak of avian influenza could kill 5 to 150 million people . Sentence 2:nan

Answer: SINGLE_APPOSITION


Question: Sentence 1:Beginning on January 30 , 1951 , Dodd led his platoon against Hill 256 , a strongly defended position near Subuk , Korea , as part of Operation Thunderbolt . Sentence 2:nan

Answer: SINGLE_CATAPHORA


Question: Sentence 1:Besides medium - chain FFAs diindolylmethane was also described as GPR84 agonist . Sentence 2:However , the target selectivity of this molecule is also questionable because diindolylmethane is an aryl hydrocarbon receptor modulator , too .

Answer:
PAIR_CONN_ANAPHORA