Thiruvananthapuram was formed on?

Answer : C

Explanation

Trivandrum....1949 July 1, Kollam ......1949 July 1, Alappuzha .....1957 August 17, Kottayam.......1949 July 1 Ernakulam ... 1958 april 1 Thrissur ...... 1949 July 1 Palakkad...... 1957 January1 Malappuram..1969 June 16 Kozhikode... 1957 January1 Kannur... 1957 January 1 Idukki.... 1972 January 26 Wynad..... 1980 November 1 Pathanamthitta.1982 November 1 Kasargod... 1984 May 24.