Step 1: Understanding the Concept
Good dairy cow breeds include Indian breeds such as Sahiwal and Sindhi and exotic breeds such as Holstein.
Step 2: Checking the groups
Gir is a cow, but Mehsana and Murrah are buffalo breeds.
Brahma, Cochin and Langshan are poultry breeds.
Nagpuri, Nili and Surati are buffalo breeds.
Step 3: Compare the options
Sahiwal, Sindhi and Holstein are all cow breeds.
Final Answer:
Sahiwal, Sindhi and Holstein are the good cow breeds.
\[ \boxed{\text{(C) }\text{Sahiwal, Sindhi, Holstein}} \]