Step 1: Understanding the Concept
The brain develops from forebrain, midbrain and hindbrain.
Step 2: Forebrain parts
The forebrain gives the telencephalon (cerebrum, with the rhinencephalon for smell) and the diencephalon (thalamus, hypothalamus).
Step 3: Hindbrain parts
The metencephalon (pons, cerebellum) and myelencephalon (medulla) belong to the hindbrain, so b and c are excluded.
Final Answer:
The forebrain includes a, d and e.
\[ \boxed{\text{(C) }\text{a, d and e}} \]