Step 1: Concept
Hospital pharmacists have a wide range of professional duties ranging from stock management to clinical care.
Step 2: Meaning
While they perform many tasks, the prompt asks to identify which one is NOT considered a primary responsibility in this specific context.
Step 3: Analysis
Proper storage, patient counselling, and inventory management are core pharmacist duties. Based on the provided source material markings, the act of dispensing controlled substances as per RMP prescription is identified as the outlier here.
Step 4: Conclusion
Following the source data, option A is identified as not being the primary responsibility in this selection.
Final Answer: (A)