With no explanation, chose the best option from "A", "B", "C" or "D". diabetes, PTSD is an unstable condition that may not manifest itself until well after the stressful event which caused it, and may wax and wane after manifestation. E.g., Hamilton v. Derwinski, 2 Vet.App. 671, 672, 674 (1992) (remanding for further PTSD findings in a case like Jones’s where evaluation at discharge from military service revealed no psychiatric distress or disorder) (subsequent history omitted). Retrospective medical diagnoses constitute relevant evidence of pre-expiration disability. See, e.g., Trenary v. Bowen, 898 F.2d 1361, 1364 (8th Cir.1990) (magistrate judge and ALJ accepted retrospective diagnosis of depression); Basinger, 725 F.2d at 1169; Parsons v. Heckler, 739 F.2d 1334, 1340 (8th Cir.1984); see also Richardson v. Heckler, 750 F.2d 506, 509 (6th Cir.1984) (<HOLDING>). Where the impairment onset date is critical,

A: holding that the alj erred in determining that the claimant was disabled when a retrospective diagnosis along with all other medical evidence supported a finding of disability
B: holding in a similar case that alj erred in failing to consider retrospective diagnosis indicating that ptsd existed from time of discharge from army
C: holding that the alj erred by failing to mention the contrary opinion of a treating physician
D: holding that district court erred in failing to consider evidence of secondary considerations
B.