Select the word-pair that best represents a similar relationship to the one expressed in the given pair of words.

(The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word)

Length : Metre

Electric current : Ampere

Length : Metre

The logic followed here is :

Metre is the measurement unit of Length

Similarly

Electric current : Ampere

Amphere is the measurement unit of Electric current