**Core Concept**
Platelet storage in a blood bank is a critical aspect of transfusion medicine. Platelets have a limited shelf life due to the risk of bacterial contamination, activation, and aggregation. The storage conditions, including temperature, agitation, and additives, play a crucial role in maintaining platelet viability.

**Why the Correct Answer is Right**
Platelets are typically stored at room temperature (20-24°C) with gentle agitation to prevent platelet activation and aggregation. The storage duration is limited to 5-7 days, depending on the storage conditions and the presence of platelet preservatives. The use of platelet preservatives, such as citrate-phosphate-dextrose-adenine (CPDA-1), can extend the storage duration up to 7 days.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because platelets cannot be stored for more than 7 days, even with optimal storage conditions.
* **Option B:** This option is incorrect because platelets are not typically stored at refrigerator temperature (4°C), which can lead to platelet activation and aggregation.

**Clinical Pearl / High-Yield Fact**
A common mistake in platelet storage is not following the recommended storage conditions, leading to platelet activation and aggregation. It is essential to store platelets at room temperature with gentle agitation to maintain their viability.

**Correct Answer:** C. 5 days.