He dismissed the idea of clothing immediately . The thought of a perfume or something like that occurred to him while wandering through one store but then he had a sudden memory of their 5th year , when Ron had gotten her perfume and her comment on it had been that it was " interesting " .

Question: What is the reason for his thinking of perfume ?
Answer: He remembered his shopping list .He wants to buy her a gift .He wanted something for his baby boy .He was looking for cologne .