You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>An analysis of the data reported in 2016 by an adverse drug reaction monitoring centre found that there were 120,000 adverse reaction reports in the province, of which 9,000 were serious adverse reaction reports. The details were shown in the table below, which of the following statements was correct? <image 1>
A. Medical institutions were the main source of reported adverse reactions.
B. Chemical drugs caused the highest rate of adverse drug reactions in the province.
C. Adverse reactions caused by Biological products need not be a concern.
D. The province has a low incidence of serious adverse reactions.

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
A
An analysis of the data reported in 2016 by an adverse drug reaction monitoring centre found that there were 120,000 adverse reaction reports in the province, of which 9,000 were serious adverse reaction reports. The details were shown in the table below, which of the following statements was correct? <image 1>
A. Medical institutions were the main source of reported adverse reactions.
B. Chemical drugs caused the highest rate of adverse drug reactions in the province.
C. Adverse reactions caused by Biological products need not be a concern.
D. The province has a low incidence of serious adverse reactions.

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val