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Answer: D

Key insight
Three of the four symbols share a common structural property — they are all formed by stacking or combining two similar shapes (figure-8 style or double-lobed). The odd one out breaks this rule.

Step by step
Step 1: Option A — a figure with a horizontal bar on top and a round double-lobed bottom: two parts stacked. ✓ (shares the double-element property)
Step 2: Option B — two circular/oval lobes stacked vertically. ✓
Step 3: Option C — two heart/lobe shapes stacked vertically. ✓
Step 4: Option D — appears to have a different number of lobes or the orientation of the combining rule is broken — the top element doesn't match the pattern of the other three symbols.
Therefore the answer is D.

Why wrong options are wrong
Options A, B, C all follow the same visual construction rule (two similar lobed shapes combined vertically).

Remember for exam
For "odd one out" visual questions, look for the underlying construction rule shared by three options — the one that violates the rule is the answer.

7:["paperId","uceed

Identify the odd one.