Bokaro was created as a separate district from Dhanbad and Giridih districts in 1956. The district was carved out of the southern part of Dhanbad district and the northern part of Giridih district. The headquarters of the district is Bokaro Steel City.
A. Dhanbad and Giridih: This is the correct answer. Bokaro was created as a separate district from Dhanbad and Giridih districts in 1956.
B. Bokaro and Ranchi: This is not the correct answer. Bokaro was created as a separate district from Dhanbad and Giridih districts, not from Ranchi district.
C. Sumeru and Jamshedpur: This is not the correct answer. Sumeru and Jamshedpur are not districts in Jharkhand.
D. Giridih and Ranchi: This is not the correct answer. Bokaro was created as a separate district from Dhanbad and Giridih districts, not from Ranchi district.