One who able to use the right and left hands equally well:

A Sinister
B Ambidextrous
C Ambivalent
D Amateur

Correct Answer: Ambidextrous

The one word substitution is Ambidextrous.

Sinister : One who able to use the left hand well.
Ambivalent : having mixed feelings or contradictory ideas about something or someone.
Amateur : a person who is contemptibly inept at a particular activity.
Ambidextrous : able to use the right and left hands equally well.

Related Questions

who is to the immediate right of P among five persons P, Q, R, S and T facing North? Statements : 1. R is third to the left of Q and P is second to the right of R. Q is to the immediate left of T who is second to the right of P.

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