Please select the arm or intervention descriptions that belong to the clinical trial below.
Title: Clinical Approaches to Correcting Vitamin D Inadequacy and Maintaining Adequacy
Brief Summary: Vitamin D is available in two forms, vitamin D2 and vitamin D3. It has previously been assumed that these two forms maintain blood vitamin D equally. However, this may not be the case. This study will evaluate whether D2 and D3 produce equal elevation of blood vitamin D. Additionally, it will evaluate whether once per month vitamin D dosing is as effective in maintaining blood vitamin D levels as daily dosing.


Options:
A: Arm Label: Calcium and vitamin D; Type: EXPERIMENTAL; Interventions: Drug: Vitamin D and calcium suplementation | Intervention Type: DRUG; Name: Vitamin D and calcium suplementation; Assigned to Arm(s): Calcium and vitamin D
B: Arm Label: 1; Type: OTHER; Interventions: Drug: Vitamin D3 2,000 IU orally once daily, Drug: Calcium Carbonate 400 mg orally twice daily | Arm Label: 2; Type: OTHER; Interventions: Drug: Vitamin D3 2,000 IU orally once daily, Drug: Calcium-Placebo | Arm Label: 3; Type: OTHER; Interventions: Drug: Calcium Carbonate 400 mg orally twice daily, Drug: Vitamin D3-Placebo | Arm Label: 4; Type: OTHER; Interventions: Drug: Vitamin D3-Placebo, Drug: Calcium-Placebo | Intervention Type: DRUG; Name: Vitamin D3 2,000 IU orally once daily; Assigned to Arm(s): 1, 2 | Intervention Type: DRUG; Name: Calcium Carbonate 400 mg orally twice daily; Assigned to Arm(s): 1, 3 | Intervention Type: DRUG; Name: Vitamin D3-Placebo; Assigned to Arm(s): 3, 4 | Intervention Type: DRUG; Name: Calcium-Placebo; Assigned to Arm(s): 2, 4
C: Arm Label: 1; Type: EXPERIMENTAL; Interventions: Dietary Supplement: Ergocalciferol (vitamin D2), Dietary Supplement: Placebo | Arm Label: 2; Type: EXPERIMENTAL; Interventions: Dietary Supplement: Ergocalciferol (vitamin D2), Dietary Supplement: Placebo | Arm Label: 3; Type: EXPERIMENTAL; Interventions: Dietary Supplement: Cholecalciferol (vitamin D3), Dietary Supplement: Placebo | Arm Label: 4; Type: EXPERIMENTAL; Interventions: Dietary Supplement: Cholecalciferol (vitamin D3), Dietary Supplement: Placebo | Intervention Type: DIETARY_SUPPLEMENT; Name: Cholecalciferol (vitamin D3); Assigned to Arm(s): 3 | Intervention Type: DIETARY_SUPPLEMENT; Name: Ergocalciferol (vitamin D2); Assigned to Arm(s): 1 | Intervention Type: DIETARY_SUPPLEMENT; Name: Ergocalciferol (vitamin D2); Assigned to Arm(s): 2 | Intervention Type: DIETARY_SUPPLEMENT; Name: Cholecalciferol (vitamin D3); Assigned to Arm(s): 4 | Intervention Type: DIETARY_SUPPLEMENT; Name: Placebo; Assigned to Arm(s): 1, 2, 3, 4
D: Arm Label: pioglitazone; Type: ACTIVE_COMPARATOR; Interventions: Drug: pioglitazone | Arm Label: rosiglitazone; Type: ACTIVE_COMPARATOR; Interventions: Drug: rosiglitazone | Arm Label: TZD placebo; Type: PLACEBO_COMPARATOR; Interventions: Drug: placebo | Arm Label: Vitamin D; Type: ACTIVE_COMPARATOR; Interventions: Dietary Supplement: Vitamin D | Arm Label: Vitamin D placebo; Type: PLACEBO_COMPARATOR; Interventions: Dietary Supplement: Placebo | Intervention Type: DRUG; Name: pioglitazone; Assigned to Arm(s): pioglitazone | Intervention Type: DRUG; Name: rosiglitazone; Assigned to Arm(s): rosiglitazone | Intervention Type: DRUG; Name: placebo; Assigned to Arm(s): TZD placebo | Intervention Type: DIETARY_SUPPLEMENT; Name: Vitamin D; Assigned to Arm(s): Vitamin D | Intervention Type: DIETARY_SUPPLEMENT; Name: Placebo; Assigned to Arm(s): Vitamin D placebo

Answer: C