The Collaborative International Dictionary of English v.0.48:

Answerable \An"swer*a*ble\, a.
   1. Obliged to answer; liable to be called to account; liable
      to pay, indemnify, or make good; accountable; amenable;
      responsible; as, an agent is answerable to his principal;
      to be answerable for a debt, or for damages.
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            Will any man argue that . . . he can not be justly
            punished, but is answerable only to God? --Swift.
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   2. Capable of being answered or refuted; admitting a
      satisfactory answer.
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            The argument, though subtle, is yet answerable.
                                                  --Johnson.
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   3. Correspondent; conformable; hence, comparable.
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            What wit and policy of man is answerable to their
            discreet and orderly course?          --Holland.
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            This revelation . . . was answerable to that of the
            apostle to the Thessalonians.         --Milton.
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   4. Proportionate; commensurate; suitable; as, an achievement
      answerable to the preparation for it.
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   5. Equal; equivalent; adequate. [Archaic]
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            Had the valor of his soldiers been answerable, he
            had reached that year, as was thought, the utmost
            bounds of Britain.                    --Milton.
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WordNet (r) 3.0 (2006):

answerable
    adj 1: capable of being answered
    2: morally or legally responsible to a higher authority;
       "parents are answerable for their child's acts"