This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
All are symptoms of acute mountain sickness except- 
Select and explain. 
A. Headache, B. Dyspnoea, C. Tachycardia, D. Light headedness
C: Tachycardia
Answer: C: Tachycardia 
Explanation: Whole body: fatigue, inability to exercise, loss of appetite, or low oxygen in the body Sleep: sleepiness or sleeping difficulty Gastrointestinal: nausea or vomiting Respiratory: rapid breathing or shoness of breath Also common: fast hea rate, headache, insufficient urine production, or respiratory distress syndrome Ref Harrison20th edition pg 2667