Step 1: Recall the cluster of IPC sections that a forensic medicine student links with medical practice and certificates.
Step 2: Section 197 of the IPC punishes a person who issues or signs a certificate that he knows or believes to be false in a material point. Applied to a physician, this is the act of giving a false medical certificate, matching option b.
Step 3: The other acts belong elsewhere. Destroying or hiding evidence is dealt with under Section 201, and giving false evidence on oath is covered by Sections 191 to 193.
Step 4: Because only the false certificate definition fits Section 197, the composite choice combining false certificate and false evidence is incorrect. The right answer is issuing a false certificate by a doctor.
\[\boxed{\text{Issuing false certificate by a doctor}}\]