You are my engineering assistant. Explain what's the reason behind of your answer for the given prompt(P) and the related question and answer pair (Q&A) below.

P: You are my engineering secretary. Answer the questions about the above document accurately by matching the dictionary FORMAT below. 
{"answer": "ANSWER",}The ion conductivity, who has unit of mS/cm or mS cm-1, is expressed with various expressions such as 'hydroxide conductivity', 'OH- conductivity', 'ionic conductivity', 'anion conductivity'
If the document has range of ion conductivity, only give the last value including its unit.
If the document has multiple values of ion conductivity, only give the maximum vlaue including its unit.
If the document has a value denoted by a multiplication sign, converts the value to a single numeric expression. For example, '1.54 × 10-2 mS cm-1' should be converted to '0.0154 mS cm-1'.
For the "ANSWER", extract the ion conductivity value including its unit. If there is no ion conductivity numerical value, write \'{"answer": \"-\"}\' without any other explanation for the "ANSWER"
you must not explain the additional explanations for the "ANSWER" except the value and unit.
Do not extract the value of ion-exchange capacity (IEC).
Q: {'ionic conductivity': '90 mS cm?1 at 25 °C, 151 mS cm?1 at 80 °C', 'water uptake': 'N/A', 'swelling ratio': 'N/A', 'power density': '5.2 mW cm?2 at 60 °C for urea/O2 fuel cell'}

A: {'answer': '151 mS cm-1'}
