Consider the question. If "A man is sitting in a brown chair with a woman sitting on his lap smiling for the camera." does that mean that "A couple are taking an engagement picture."?
Options:
- yes
- it is not possible to tell
- no
 What is the step-by-step reasoning process to arrive at the answer: it is not possible to tell?
Two people smiling for a camera do not mean that they are engagement pictures.