Statement & Conclusion
Statement: All engineers are intelligent. Some doctors are engineers.
Conclusion: I. Some doctors are intelligent.
II. All intelligent people are engineers.
Statement analysis: - "All engineers are intelligent" implies that the set of engineers is a subset of the set of intelligent individuals (engineers \(\subseteq\) intelligent).
- "Some doctors are engineers" signifies that there is an overlap between the group of doctors and the group of engineers.
Conclusion I assessment: "Some doctors are intelligent." Given that some doctors are engineers and all engineers are intelligent, it logically follows that these doctors who are also engineers must be intelligent.
\(\Rightarrow\) Conclusion I is valid. Conclusion II assessment: "All intelligent people are engineers." The provided statement establishes that engineers are intelligent, but it does not assert the converse, i.e., that all intelligent individuals are engineers. It is possible for intelligent people to exist who are not engineers.
\(\Rightarrow\) Conclusion II is invalid.
Final answer Answer: \(\boxed{\text{(A) Only I follows}}\)