Which of the following signs is positive if a postnatal woman has DVT?

Correct option is D

Homan's sign is used to assess for deep vein thrombosis (DVT). It is considered positive if pain is elicited in the calf when the foot is dorsiflexed. A positive Homan's sign suggests possible DVT, though it is not a definitive diagnostic tool and further testing is necessary.
Explanation of options: (a) ✘ Incorrect. Fleischner sign is related to the appearance of pulmonary embolism on imaging, not DVT. (b) ✘ Incorrect. Romberg’s sign is used to assess balance and proprioception, unrelated to DVT. (c) ✘ Incorrect. Spalding sign is associated with the appearance of a fetus in utero, not related to DVT. (d) ✔ Correct. Homan’s sign is a clinical test used to check for the presence of DVT.