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Jason Starr
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I believe this is trivially false: there are families over a compact Kähler base having no singular fibers yet with nontrivial, finite monodromy group. The simplest example I know of is an isotrivial family where $B$ is an elliptic curve and the fibers $X_b$ are hyperelliptic curves.

Jason Starr
  • 4.1k
  • 1
  • 93
  • 111