Task: Question Generation
Input (English): Context : Sendia massacre (Bengali: সেনদিয়া হত্যাকান্ড) was a massacre of unarmed Bengali Hindus in Sendia village in undivided Faridpur district on 20 May 1971 by the Pakistan Army. 
Answer : 20 May 1971
Output (English): When did Sendia massacre occurr?