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While they can later surmise there must have been a series of major exchanges , as a simple , single exchange of ' counter-force ' strikes would not account for the sheer scale of the fallout they later find , and they can also conclude other nuclear powers , like India , Pakistan , etc. , have also fired at each other , the crew never learns with certainty what led to the launches or the exact sequence of events .
 India, Pakistan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 India, Pakistan