Step 1: Understanding the Concept:
Registered indigenous pig genetic resources of India: the Doom pig is a recognized native porcine breed of Assam.
Step 2: Detailed Explanation:
In Indian livestock genetic biodiversity (NBAGR registered breeds):
- Doom (B only): An officially recognized indigenous breed of Pig (Swine) native to the Brahmaputra valley (Dhubri, Kokrajhar, and Bongaigaon districts of Assam).
- Features black coat color, short ears, thick bristles on the neck and back, and high adaptation to foraging in marshy/wet agro-climatic conditions.
- (Other registered native pig breeds include Ghungroo, Niang Megha, Tenyi Vo, Mali, and Wak Chambil).
Step 3: Final Answer:
Thus, Doom is a breed of B only (Pig), matching option (B).