Based on 430.10(e) and 430.30, you may want to consider filing both an answer and a demurrer. The answer should contain an affirmative defense of "failure to state a cause of action" because the complaint does not contain enough facts to state a cause of action against THIS defendant.
The answer provides you the back up you need on a substantive basis in case your motion to dismiss
(demurrer) fails. The code gives you the option, but if it were me, I would do both.
The link above has a sample demurrer that you can use as a go-by.
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