Road bikes which can take wider tyres?

Can anyone advise on road bikes which can take wider tyres?
I'd like to get my wife a bike for mostly road use, but there are some gravel/stoney cycle paths around which we also like to use.
She would like drop bars, so is it best to get a cyclocross bike and fit road tyres when appropriate, or can I get her a road bike and fit fider tyres when appropriate?
Thank you.
I'd like to get my wife a bike for mostly road use, but there are some gravel/stoney cycle paths around which we also like to use.
She would like drop bars, so is it best to get a cyclocross bike and fit road tyres when appropriate, or can I get her a road bike and fit fider tyres when appropriate?
Thank you.
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