Ans. G7

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This seems to be a package installation problem in MiKTeX setup and nothing related to elsarticle packages. So, it would be good to have a look at the following MiKTeX page before you proceed. Here you may find instruction to add packages in your TeX tree.

  http://www.miktex.org/2.8/issues

Or if you are on Ubuntu or Debian, try installing the texlive-fonts-recommended package.