In the following question, select the odd number from the given alternatives.

Where among the following are the National Institutes for the mentally challenged persons located?

A narrow strip of land that connects two larger land masses is called:

Select the number that can replace the question mark (?) in the following series.
423, 407, 439, 391, 455, ?

___________ is responsible for blood clotting.

Which letter set will come in place of question mark (?) in the following series?
LOK, PQP, VSV, DUC, ?

Which of the following Economic survey was also famous as Pink Economic survey?

Select the number that can replace the question mark (?) in the following series.
2807, 1400, 697, ?, 171, 84