Which of the following is not state-symbol of Mizoram?
1. "Himalayan serow" is the state animal of Mizoram.
2. "Night-flowering jasmine" is the state flower of Mizoram.
3. "Mrs. Hume's pheasant " is the state bird of Mizoram.
4. "Indian rose chestnut " is the state tree of Mizoram.