Which of the following is incorrectly matched?

These are the options for the question :Which of the following is incorrectly matched?

NAME OF THE STATE                                          COAL MINING CENTRE
a. Telangana                                                      Singareni
b. Maharashtra                                                   Korba
c. Odisha                                                           Talcher
d. West Bengal                                                   Raniganj

The correct answer is -b. Maharashtra –                        Korba