Does the speaker realize that his mental problem might be related with his experience in the war when he recovered？

Does the speaker realize that his mental problem might be related with his experience in the war when he recovered？
A.No， he didn'；t realize it at all
B.Yes， but he didn'；t realize it at the beginning
C.Yes， he is very clear about it
D.No， but he later realized that it was PTSD
正确答案：No， but he later realized that it was PTSD