In the clinical thermometer, the function of the kink is to?

i. Prevent the backflow of mercury after use.

ii. Ensure the backflow of mercury after use.

iii. Maintain the thermometric property of mercury.

iv. Allow the temperature attained to be read.

A. i only
B. i and ii only
C. i and iv only
D. iii and iv only

Correct Answer: Option C

C. i and iv only